#1286 Remove header comments from stubs (#1292)

- Updates documentation related to previously required comment headers.
- Removes all comment headers from stubs
- Occasionally included a header for stubs that were noted to be incomplete or contained todo's.

stdlib/2and3/distutils/version.pyi

@@ -1,7 +1,3 @@
-# Stubs for distutils.version (Python 2 and 3.5)
-#
-# NOTE: This dynamically typed stub was automatically generated by stubgen.
-
 import sys
 from typing import Any