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

[Éric Araujo]

Éric Araujo added the comment:

Oh, I had totally missed that the mismatch was between the function signature in the docs and another part of the doc (I thought it was between the real function signature and the doc).  Good catch!

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