[docs] [issue28644] Document recent changes in typing.py

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5bf2ea0d3830 by Guido van Rossum in branch '3.5':
Issue 28644: Document recent changes in typing.py (Ivan L)
https://hg.python.org/cpython/rev/5bf2ea0d3830

New changeset 72a2c90abdec by Guido van Rossum in branch '3.6':
Issue 28644: Document recent changes in typing.py (Ivan L) (3.5->3.6)
https://hg.python.org/cpython/rev/72a2c90abdec

New changeset c4394da344b7 by Guido van Rossum in branch 'default':
Issue 28644: Document recent changes in typing.py (Ivan L) (3.6->3.7)
https://hg.python.org/cpython/rev/c4394da344b7

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nosy: +python-dev

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<http://bugs.python.org/issue28644>
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