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

[Taavi Burns]

Taavi Burns added the comment:

Ah, yes, I could have been more clear that I wasn't even looking at the source code itself. :)

Thanks!

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resolution: fixed -> 
status: closed -> open
versions:  -Python 3.2, Python 3.4

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