[docs] [issue18531] Undocumented different between METH_KEYWORDS and **kws

[Roundup Robot]

Roundup Robot added the comment:

New changeset e3283b4ae61d by Serhiy Storchaka in branch '3.5':
Backported tests for issue #18531.
https://hg.python.org/cpython/rev/e3283b4ae61d

New changeset 621e0a3249c2 by Serhiy Storchaka in branch '2.7':
Backported tests for issue #18531.
https://hg.python.org/cpython/rev/621e0a3249c2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18531>
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