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

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

The title of #8350 is outdated. The discussion has shifted from one specific function to the general doc problem. Since it contains references and opinions, I think it supersedes this one.

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<http://bugs.python.org/issue9426>
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