Added limit documentation for reddit.user.moderator_subreddits() (#1145)

* Documented moderator_subreddits's limit of 100

.github/CONTRIBUTING.md

@@ -32,7 +32,7 @@ to you, it likely is not to the person asking the question.
    commenting on the issue. This act will hopefully minimize any duplicate
    work.
 
-0. Prior to creating a pull request run the `pre_push.sh` script. This script
+0. Prior to creating a pull request run the `pre_push.py` script. This script
    depends on the tools `black` `flake8`, `pylint`, and `pydocstyle`. They can
    be installed via `pip install black flake8 pydocstyle pylint`.
 

praw/models/user.py

@@ -105,6 +105,18 @@ def moderator_subreddits(self, **generator_kwargs):
         Additional keyword arguments are passed in the initialization of
         :class:`.ListingGenerator`.
 
+        .. note:: This method will return a maximum of 100 moderated
+           subreddits, ordered by subscriber count. To retrieve more than
+           100 moderated subreddits, please see :meth:`.Redditor.moderated`.
+
+        Usage:
+
+        .. code-block:: python
+
+           for subreddit in reddit.user.moderator_subreddits():
+               print(subreddit.display_name)
+
+
         """
         return ListingGenerator(
             self._reddit, API_PATH["my_moderator"], **generator_kwargs