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

[Roundup Robot]

Roundup Robot added the comment:

New changeset c0060567f35d by Yury Selivanov in branch '3.6':
Issue #28635: What's New in Python 3.6 updates
https://hg.python.org/cpython/rev/c0060567f35d

New changeset 69bdf8bdfd61 by Yury Selivanov in branch 'default':
Merge 3.6 (issue #28635)
https://hg.python.org/cpython/rev/69bdf8bdfd61

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