Clean up docstrings: - Include a blank line between the signature line and the description   (Guido sez). - Don't include "-> None" for API functions that always return None   because they don't have a meaningful return value.
Clean up docstrings:
- Include a blank line between the signature line and the description
  (Guido sez).
- Don't include "-> None" for API functions that always return None
  because they don't have a meaningful return value.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator