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

[Roundup Robot]

Roundup Robot added the comment:

New changeset d805982336a0 by Ezio Melotti in branch '2.7':
#16556: Fix inconsistency between kwds and kwargs.  Patch by Taavi Burns.
http://hg.python.org/cpython/rev/d805982336a0

New changeset 565c3bbed7d3 by Ezio Melotti in branch '3.2':
#16556: Fix inconsistency between kwds and kwargs.  Patch by Taavi Burns.
http://hg.python.org/cpython/rev/565c3bbed7d3

New changeset ae19d86b71c8 by Ezio Melotti in branch '3.3':
#16556: merge with 3.2.
http://hg.python.org/cpython/rev/ae19d86b71c8

New changeset c28f593ea0cb by Ezio Melotti in branch 'default':
#16556: merge with 3.3.
http://hg.python.org/cpython/rev/c28f593ea0cb

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nosy: +python-dev

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