Clean up docstrings (#22679)

* Clean up docstrings

* Fix long lines

* Fix more docstrings

* Fix more docstrings

* Fix more docstrings

homeassistant/components/github/sensor.py

@@ -1,9 +1,4 @@
-"""
-Support for GitHub.
-
-For more details about this platform, please refer to the documentation at
-https://home-assistant.io/components/sensor.github/
-"""
+"""Support for GitHub."""
 from datetime import timedelta
 import logging
 import voluptuous as vol