[docs] [issue28635] Update What's New for 3.6

[Roundup Robot]

Roundup Robot added the comment:

New changeset 993215342a95 by Yury Selivanov in branch '3.6':
Issue #28635: what's new in 3.6: add a few more notes on typing
https://hg.python.org/cpython/rev/993215342a95

New changeset c3b4eea73615 by Yury Selivanov in branch 'default':
Merge 3.6 (issue #28635)
https://hg.python.org/cpython/rev/c3b4eea73615

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