[docs] [issue9426] Explicitly state lack of support for keyword arguments in builtin functions

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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resolution:  -> duplicate
stage:  -> committed/rejected
superseder:  -> os.mkdir doc comment is incorrect

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9426>
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