[docs] [issue33014] Clarify str.isidentifier docstring; fix keyword.iskeyword docstring

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

I think my wording would be an improvement to the docs as well.  You could link just the keyword function if you are worried about too many links, since that would keep the link count the same.

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<https://bugs.python.org/issue33014>
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