[docs] [issue19934] collections.Counter.most_common does not document `None` as acceptable input.

[Roundup Robot]

Roundup Robot added the comment:

New changeset 8440dda28ffe by Raymond Hettinger in branch '3.4':
Issue #19934:  Document *None* as an acceptable input to Counter.most_common([n])
https://hg.python.org/cpython/rev/8440dda28ffe

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nosy: +python-dev

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