[docs] [issue19573] Fix the docstring of inspect.Parameter and the implementation of _ParameterKind

[Roundup Robot]

Roundup Robot added the comment:

New changeset c2b94f891c88 by Yury Selivanov in branch 'default':
inspect.signature: Use enum for parameter kind constants. Closes #19573
http://hg.python.org/cpython/rev/c2b94f891c88

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nosy: +python-dev
resolution:  -> fixed
stage: patch review -> committed/rejected
status: open -> closed

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<http://bugs.python.org/issue19573>
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