[SPARK-3412] [PySpark] Replace Epydoc with Sphinx to generate Python API docs

Retire Epydoc, use Sphinx to generate API docs.

Refine Sphinx docs, also convert some docstrings into Sphinx style.

It looks like:
![api doc](https://cloud.githubusercontent.com/assets/40902/4538272/9e2d4f10-4dec-11e4-8d96-6e45a8fe51f9.png)

Author: Davies Liu <davies.liu@gmail.com>

Closes #2689 from davies/docs and squashes the following commits:

bf4a0a5 [Davies Liu] fix links
3fb1572 [Davies Liu] fix _static in jekyll
65a287e [Davies Liu] fix scripts and logo
8524042 [Davies Liu] Merge branch 'master' of github.com:apache/spark into docs
d5b874a [Davies Liu] Merge branch 'master' of github.com:apache/spark into docs
4bc1c3c [Davies Liu] refactor
746d0b6 [Davies Liu] @param -> :param
240b393 [Davies Liu] replace epydoc with sphinx doc

1 files changed, 4 insertions, 4 deletions

diff --git a/python/pyspark/conf.py b/python/pyspark/conf.py
index b64875a3f4..dc7cd0bce5 100644
--- a/python/pyspark/conf.py
+++ b/python/pyspark/conf.py
@@ -83,11 +83,11 @@ class SparkConf(object):
         """
         Create a new Spark configuration.
 
-        @param loadDefaults: whether to load values from Java system
+        :param loadDefaults: whether to load values from Java system
                properties (True by default)
-        @param _jvm: internal parameter used to pass a handle to the
+        :param _jvm: internal parameter used to pass a handle to the
                Java VM; does not need to be set by users
-        @param _jconf: Optionally pass in an existing SparkConf handle
+        :param _jconf: Optionally pass in an existing SparkConf handle
                to use its parameters
         """
         if _jconf:
@@ -139,7 +139,7 @@ class SparkConf(object):
         """
         Set multiple parameters, passed as a list of key-value pairs.
 
-        @param pairs: list of key-value pairs to set
+        :param pairs: list of key-value pairs to set
         """
         for (k, v) in pairs:
             self._jconf.set(k, v)