This commit adds a few missing return types to the Python 3 textwrap
stubs and fleshes out the Python 2 textwrap stubs so they're on par with
the Python 3 version.
This change:
1. Changes the order of the arguments in Python 2 and Python 3
to match the order from the source code instead of the
documentation.
2. Adds other undocumented attributes besides whitespace_trans
(for consistency).
3. Moves the '*' argument in TextWrapper.__init__ for Python 3
to match the source code.
4. Made function stub formatting consistent with typeshed style
conventions.
