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

[Taavi Burns]

Taavi Burns added the comment:

The issue of churn is totally fair.

I'd still advocate for the attached patch, as it's tiny and fixes an inconsistency between the function signature and the docs that are referring to that signature.

Thanks!

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16556>
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