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

[Roundup Robot]

Roundup Robot added the comment:

New changeset bcd4ab982429 by Yury Selivanov in branch '3.6':
Issue #28635: Fix a couple of missing/incorrect versionchanged tags
https://hg.python.org/cpython/rev/bcd4ab982429

New changeset 5c4ce500dd35 by Yury Selivanov in branch 'default':
Merge 3.6 (issue #28635)
https://hg.python.org/cpython/rev/5c4ce500dd35

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