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

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

As I posted above, keywork.iskeyword already has a bizarrely incorrect docstring, so how can there be a performance impact? And why single out such a rarely used function?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33014>
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