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

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

For changing a docstring we have to change the implementation of iskeyword(). It seems to me that the current implementation is the fastest, and any other implementation will be a tiny bit slower.

I just wanted to say that this enhancement has a non-zero cost.

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