[issue8350] Document lack of support for keyword arguments in C functions

[Mark Lawrence]

Mark Lawrence added the comment:

Has the Argument Clinic had an impact on this or is that a different kettle of fish?

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nosy: +BreamoreBoy
versions: +Python 3.5 -Python 3.2, Python 3.3

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<http://bugs.python.org/issue8350>
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