[docs] [issue16556] Update string.Formatter.vformat documentation to say "**kwargs"

[Ezio Melotti]

Ezio Melotti added the comment:

The patch looked OK, so I committed it.
Regarding similar cleanups I think it's OK to do them only if the inconsistency is in the same function.  If different functions use kwds or kwargs in different places but they do it consistently, then it doesn't matter.

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assignee: docs at python -> ezio.melotti
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed
versions: +Python 3.2, Python 3.4

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<http://bugs.python.org/issue16556>
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