[SPARK-3359][DOCS] Fix greater-than symbols in Javadoc to allow building with Java 8

## What changes were proposed in this pull request?

The API documentation build was failing when using Java 8 due to incorrect character `>` in Javadoc.

Replace `>` with literals in Javadoc to allow the build to pass.

## How was this patch tested?

Documentation was built and inspected manually to ensure it still displays correctly in the browser

```
cd docs && jekyll serve
```

Author: Michal Senkyr <mike.senkyr@gmail.com>

Closes #16201 from michalsenkyr/javadoc8-gt-fix.

6 files changed, 6 insertions, 6 deletions

diff --git a/mllib/src/main/scala/org/apache/spark/ml/classification/DecisionTreeClassifier.scala b/mllib/src/main/scala/org/apache/spark/ml/classification/DecisionTreeClassifier.scala
index 7e0bc19a7a..9f60f0896e 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/classification/DecisionTreeClassifier.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/classification/DecisionTreeClassifier.scala
@@ -81,7 +81,7 @@ class DecisionTreeClassifier @Since("1.4.0") (
    * E.g. 10 means that the cache will get checkpointed every 10 iterations.
    * This is only used if cacheNodeIds is true and if the checkpoint directory is set in
    * [[org.apache.spark.SparkContext]].
-   * Must be >= 1.
+   * Must be at least 1.
    * (default = 10)
    * @group setParam
    */
diff --git a/mllib/src/main/scala/org/apache/spark/ml/classification/GBTClassifier.scala b/mllib/src/main/scala/org/apache/spark/ml/classification/GBTClassifier.scala
index c5fc3c8772..c99b63b25d 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/classification/GBTClassifier.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/classification/GBTClassifier.scala
@@ -98,7 +98,7 @@ class GBTClassifier @Since("1.4.0") (
    * E.g. 10 means that the cache will get checkpointed every 10 iterations.
    * This is only used if cacheNodeIds is true and if the checkpoint directory is set in
    * [[org.apache.spark.SparkContext]].
-   * Must be >= 1.
+   * Must be at least 1.
    * (default = 10)
    * @group setParam
    */
diff --git a/mllib/src/main/scala/org/apache/spark/ml/classification/RandomForestClassifier.scala b/mllib/src/main/scala/org/apache/spark/ml/classification/RandomForestClassifier.scala
index 34c055dce6..5bbaafeff3 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/classification/RandomForestClassifier.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/classification/RandomForestClassifier.scala
@@ -83,7 +83,7 @@ class RandomForestClassifier @Since("1.4.0") (
    * E.g. 10 means that the cache will get checkpointed every 10 iterations.
    * This is only used if cacheNodeIds is true and if the checkpoint directory is set in
    * [[org.apache.spark.SparkContext]].
-   * Must be >= 1.
+   * Must be at least 1.
    * (default = 10)
    * @group setParam
    */
diff --git a/mllib/src/main/scala/org/apache/spark/ml/regression/DecisionTreeRegressor.scala b/mllib/src/main/scala/org/apache/spark/ml/regression/DecisionTreeRegressor.scala
index 0cdfa7b0b7..01c5cc1c7e 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/regression/DecisionTreeRegressor.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/regression/DecisionTreeRegressor.scala
@@ -80,7 +80,7 @@ class DecisionTreeRegressor @Since("1.4.0") (@Since("1.4.0") override val uid: S
    * E.g. 10 means that the cache will get checkpointed every 10 iterations.
    * This is only used if cacheNodeIds is true and if the checkpoint directory is set in
    * [[org.apache.spark.SparkContext]].
-   * Must be >= 1.
+   * Must be at least 1.
    * (default = 10)
    * @group setParam
    */
diff --git a/mllib/src/main/scala/org/apache/spark/ml/regression/GBTRegressor.scala b/mllib/src/main/scala/org/apache/spark/ml/regression/GBTRegressor.scala
index 49a3f8b6b5..f8ab3d3a45 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/regression/GBTRegressor.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/regression/GBTRegressor.scala
@@ -95,7 +95,7 @@ class GBTRegressor @Since("1.4.0") (@Since("1.4.0") override val uid: String)
    * E.g. 10 means that the cache will get checkpointed every 10 iterations.
    * This is only used if cacheNodeIds is true and if the checkpoint directory is set in
    * [[org.apache.spark.SparkContext]].
-   * Must be >= 1.
+   * Must be at least 1.
    * (default = 10)
    * @group setParam
    */
diff --git a/mllib/src/main/scala/org/apache/spark/ml/regression/RandomForestRegressor.scala b/mllib/src/main/scala/org/apache/spark/ml/regression/RandomForestRegressor.scala
index 67fb648625..ca4a50b825 100644
--- a/mllib/src/main/scala/org/apache/spark/ml/regression/RandomForestRegressor.scala
+++ b/mllib/src/main/scala/org/apache/spark/ml/regression/RandomForestRegressor.scala
@@ -82,7 +82,7 @@ class RandomForestRegressor @Since("1.4.0") (@Since("1.4.0") override val uid: S
    * E.g. 10 means that the cache will get checkpointed every 10 iterations.
    * This is only used if cacheNodeIds is true and if the checkpoint directory is set in
    * [[org.apache.spark.SparkContext]].
-   * Must be >= 1.
+   * Must be at least 1.
    * (default = 10)
    * @group setParam
    */