[SPARK-17561][DOCS] DataFrameWriter documentation formatting problems

## What changes were proposed in this pull request?

Fix `<ul> / <li>` problems in SQL scaladoc.

## How was this patch tested?

Scaladoc build and manual verification of generated HTML.

Author: Sean Owen <sowen@cloudera.com>

Closes #15117 from srowen/SPARK-17561.

3 files changed, 53 insertions, 29 deletions

diff --git a/sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala b/sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala
index 93bf74d06b..d29d90ce40 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/DataFrameReader.scala
@@ -269,14 +269,15 @@ class DataFrameReader private[sql](sparkSession: SparkSession) extends Logging {
    * <li>`allowBackslashEscapingAnyCharacter` (default `false`): allows accepting quoting of all
    * character using backslash quoting mechanism</li>
    * <li>`mode` (default `PERMISSIVE`): allows a mode for dealing with corrupt records
-   * during parsing.</li>
-   * <ul>
-   *  <li> - `PERMISSIVE` : sets other fields to `null` when it meets a corrupted record, and puts
-   *  the malformed string into a new field configured by `columnNameOfCorruptRecord`. When
-   *  a schema is set by user, it sets `null` for extra fields.</li>
-   *  <li> - `DROPMALFORMED` : ignores the whole corrupted records.</li>
-   *  <li> - `FAILFAST` : throws an exception when it meets corrupted records.</li>
-   * </ul>
+   * during parsing.
+   *   <ul>
+   *     <li>`PERMISSIVE` : sets other fields to `null` when it meets a corrupted record, and puts
+   *     the malformed string into a new field configured by `columnNameOfCorruptRecord`. When
+   *     a schema is set by user, it sets `null` for extra fields.</li>
+   *     <li>`DROPMALFORMED` : ignores the whole corrupted records.</li>
+   *     <li>`FAILFAST` : throws an exception when it meets corrupted records.</li>
+   *   </ul>
+   * </li>
    * <li>`columnNameOfCorruptRecord` (default is the value specified in
    * `spark.sql.columnNameOfCorruptRecord`): allows renaming the new field having malformed string
    * created by `PERMISSIVE` mode. This overrides `spark.sql.columnNameOfCorruptRecord`.</li>
@@ -395,13 +396,14 @@ class DataFrameReader private[sql](sparkSession: SparkSession) extends Logging {
    * <li>`maxMalformedLogPerPartition` (default `10`): sets the maximum number of malformed rows
    * Spark will log for each partition. Malformed records beyond this number will be ignored.</li>
    * <li>`mode` (default `PERMISSIVE`): allows a mode for dealing with corrupt records
-   *    during parsing.</li>
-   * <ul>
-   *   <li> - `PERMISSIVE` : sets other fields to `null` when it meets a corrupted record. When
-   *     a schema is set by user, it sets `null` for extra fields.</li>
-   *   <li> - `DROPMALFORMED` : ignores the whole corrupted records.</li>
-   *   <li> - `FAILFAST` : throws an exception when it meets corrupted records.</li>
-   * </ul>
+   *    during parsing.
+   *   <ul>
+   *     <li>`PERMISSIVE` : sets other fields to `null` when it meets a corrupted record. When
+   *       a schema is set by user, it sets `null` for extra fields.</li>
+   *     <li>`DROPMALFORMED` : ignores the whole corrupted records.</li>
+   *     <li>`FAILFAST` : throws an exception when it meets corrupted records.</li>
+   *   </ul>
+   * </li>
    * </ul>
    * @since 2.0.0
    */
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala b/sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala
index c05c7a6551..e137f076a0 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala
@@ -397,7 +397,9 @@ final class DataFrameWriter[T] private[sql](ds: Dataset[T]) {
    * your external database systems.
    *
    * You can set the following JDBC-specific option(s) for storing JDBC:
+   * <ul>
    * <li>`truncate` (default `false`): use `TRUNCATE TABLE` instead of `DROP TABLE`.</li>
+   * </ul>
    *
    * In case of failures, users should turn off `truncate` option to use `DROP TABLE` again. Also,
    * due to the different behavior of `TRUNCATE TABLE` among DBMS, it's not always safe to use this.
@@ -486,6 +488,7 @@ final class DataFrameWriter[T] private[sql](ds: Dataset[T]) {
    * }}}
    *
    * You can set the following JSON-specific option(s) for writing JSON files:
+   * <ul>
    * <li>`compression` (default `null`): compression codec to use when saving to file. This can be
    * one of the known case-insensitive shorten names (`none`, `bzip2`, `gzip`, `lz4`,
    * `snappy` and `deflate`). </li>
@@ -495,6 +498,7 @@ final class DataFrameWriter[T] private[sql](ds: Dataset[T]) {
    * <li>`timestampFormat` (default `yyyy-MM-dd'T'HH:mm:ss.SSSZZ`): sets the string that
    * indicates a timestamp format. Custom date formats follow the formats at
    * `java.text.SimpleDateFormat`. This applies to timestamp type.</li>
+   * </ul>
    *
    * @since 1.4.0
    */
@@ -510,10 +514,12 @@ final class DataFrameWriter[T] private[sql](ds: Dataset[T]) {
    * }}}
    *
    * You can set the following Parquet-specific option(s) for writing Parquet files:
+   * <ul>
    * <li>`compression` (default is the value specified in `spark.sql.parquet.compression.codec`):
    * compression codec to use when saving to file. This can be one of the known case-insensitive
    * shorten names(none, `snappy`, `gzip`, and `lzo`). This will override
    * `spark.sql.parquet.compression.codec`.</li>
+   * </ul>
    *
    * @since 1.4.0
    */
@@ -529,9 +535,11 @@ final class DataFrameWriter[T] private[sql](ds: Dataset[T]) {
    * }}}
    *
    * You can set the following ORC-specific option(s) for writing ORC files:
+   * <ul>
    * <li>`compression` (default `snappy`): compression codec to use when saving to file. This can be
    * one of the known case-insensitive shorten names(`none`, `snappy`, `zlib`, and `lzo`).
    * This will override `orc.compress`.</li>
+   * </ul>
    *
    * @since 1.5.0
    * @note Currently, this method can only be used after enabling Hive support
@@ -553,9 +561,11 @@ final class DataFrameWriter[T] private[sql](ds: Dataset[T]) {
    * }}}
    *
    * You can set the following option(s) for writing text files:
+   * <ul>
    * <li>`compression` (default `null`): compression codec to use when saving to file. This can be
    * one of the known case-insensitive shorten names (`none`, `bzip2`, `gzip`, `lz4`,
    * `snappy` and `deflate`). </li>
+   * </ul>
    *
    * @since 1.6.0
    */
@@ -571,6 +581,7 @@ final class DataFrameWriter[T] private[sql](ds: Dataset[T]) {
    * }}}
    *
    * You can set the following CSV-specific option(s) for writing CSV files:
+   * <ul>
    * <li>`sep` (default `,`): sets the single character as a separator for each
    * field and value.</li>
    * <li>`quote` (default `"`): sets the single character used for escaping quoted values where
@@ -593,6 +604,7 @@ final class DataFrameWriter[T] private[sql](ds: Dataset[T]) {
    * <li>`timestampFormat` (default `yyyy-MM-dd'T'HH:mm:ss.SSSZZ`): sets the string that
    * indicates a timestamp format. Custom date formats follow the formats at
    * `java.text.SimpleDateFormat`. This applies to timestamp type.</li>
+   * </ul>
    *
    * @since 2.0.0
    */
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/streaming/DataStreamReader.scala b/sql/core/src/main/scala/org/apache/spark/sql/streaming/DataStreamReader.scala
index 3ad1125229..c25f71af73 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/streaming/DataStreamReader.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/streaming/DataStreamReader.scala
@@ -161,6 +161,7 @@ final class DataStreamReader private[sql](sparkSession: SparkSession) extends Lo
    * schema in advance, use the version that specifies the schema to avoid the extra scan.
    *
    * You can set the following JSON-specific options to deal with non-standard JSON files:
+   * <ul>
    * <li>`maxFilesPerTrigger` (default: no max limit): sets the maximum number of new files to be
    * considered in every trigger.</li>
    * <li>`primitivesAsString` (default `false`): infers all primitive values as a string type</li>
@@ -175,14 +176,15 @@ final class DataStreamReader private[sql](sparkSession: SparkSession) extends Lo
    * <li>`allowBackslashEscapingAnyCharacter` (default `false`): allows accepting quoting of all
    * character using backslash quoting mechanism</li>
    * <li>`mode` (default `PERMISSIVE`): allows a mode for dealing with corrupt records
-   * during parsing.</li>
-   * <ul>
-   *  <li>`PERMISSIVE` : sets other fields to `null` when it meets a corrupted record, and puts the
-   *  malformed string into a new field configured by `columnNameOfCorruptRecord`. When
-   *  a schema is set by user, it sets `null` for extra fields.</li>
-   *  <li>`DROPMALFORMED` : ignores the whole corrupted records.</li>
-   *  <li>`FAILFAST` : throws an exception when it meets corrupted records.</li>
-   * </ul>
+   * during parsing.
+   *   <ul>
+   *     <li>`PERMISSIVE` : sets other fields to `null` when it meets a corrupted record, and puts
+   *     the malformed string into a new field configured by `columnNameOfCorruptRecord`. When
+   *     a schema is set by user, it sets `null` for extra fields.</li>
+   *     <li>`DROPMALFORMED` : ignores the whole corrupted records.</li>
+   *     <li>`FAILFAST` : throws an exception when it meets corrupted records.</li>
+   *   </ul>
+   * </li>
    * <li>`columnNameOfCorruptRecord` (default is the value specified in
    * `spark.sql.columnNameOfCorruptRecord`): allows renaming the new field having malformed string
    * created by `PERMISSIVE` mode. This overrides `spark.sql.columnNameOfCorruptRecord`.</li>
@@ -192,6 +194,7 @@ final class DataStreamReader private[sql](sparkSession: SparkSession) extends Lo
    * <li>`timestampFormat` (default `yyyy-MM-dd'T'HH:mm:ss.SSSZZ`): sets the string that
    * indicates a timestamp format. Custom date formats follow the formats at
    * `java.text.SimpleDateFormat`. This applies to timestamp type.</li>
+   * </ul>
    *
    * @since 2.0.0
    */
@@ -207,6 +210,7 @@ final class DataStreamReader private[sql](sparkSession: SparkSession) extends Lo
    * specify the schema explicitly using [[schema]].
    *
    * You can set the following CSV-specific options to deal with CSV files:
+   * <ul>
    * <li>`maxFilesPerTrigger` (default: no max limit): sets the maximum number of new files to be
    * considered in every trigger.</li>
    * <li>`sep` (default `,`): sets the single character as a separator for each
@@ -245,12 +249,14 @@ final class DataStreamReader private[sql](sparkSession: SparkSession) extends Lo
    * <li>`maxCharsPerColumn` (default `1000000`): defines the maximum number of characters allowed
    * for any given value being read.</li>
    * <li>`mode` (default `PERMISSIVE`): allows a mode for dealing with corrupt records
-   *    during parsing.</li>
-   * <ul>
-   *   <li>`PERMISSIVE` : sets other fields to `null` when it meets a corrupted record. When
-   *     a schema is set by user, it sets `null` for extra fields.</li>
-   *   <li>`DROPMALFORMED` : ignores the whole corrupted records.</li>
-   *   <li>`FAILFAST` : throws an exception when it meets corrupted records.</li>
+   *    during parsing.
+   *   <ul>
+   *     <li>`PERMISSIVE` : sets other fields to `null` when it meets a corrupted record. When
+   *       a schema is set by user, it sets `null` for extra fields.</li>
+   *     <li>`DROPMALFORMED` : ignores the whole corrupted records.</li>
+   *     <li>`FAILFAST` : throws an exception when it meets corrupted records.</li>
+   *   </ul>
+   * </li>
    * </ul>
    *
    * @since 2.0.0
@@ -263,12 +269,14 @@ final class DataStreamReader private[sql](sparkSession: SparkSession) extends Lo
    * Loads a Parquet file stream, returning the result as a [[DataFrame]].
    *
    * You can set the following Parquet-specific option(s) for reading Parquet files:
+   * <ul>
    * <li>`maxFilesPerTrigger` (default: no max limit): sets the maximum number of new files to be
    * considered in every trigger.</li>
    * <li>`mergeSchema` (default is the value specified in `spark.sql.parquet.mergeSchema`): sets
    * whether we should merge schemas collected from all
    * Parquet part-files. This will override
    * `spark.sql.parquet.mergeSchema`.</li>
+   * </ul>
    *
    * @since 2.0.0
    */
@@ -292,8 +300,10 @@ final class DataStreamReader private[sql](sparkSession: SparkSession) extends Lo
    * }}}
    *
    * You can set the following text-specific options to deal with text files:
+   * <ul>
    * <li>`maxFilesPerTrigger` (default: no max limit): sets the maximum number of new files to be
    * considered in every trigger.</li>
+   * </ul>
    *
    * @since 2.0.0
    */