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

[Matthew Gilson]

Matthew Gilson added the comment:

This is a very simple patch which addresses the issue.  I am still curious whether the reported function signature should be changed from:

    .. method:: most_common([n])

to:

    .. method:: most_common(n=None)

.  Any thoughts?

Also, while I was in there, I changed a few *None* to ``None`` for consistency with the rest of the documentation.

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keywords: +patch
Added file: http://bugs.python.org/file33050/mywork.patch

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