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

[Serhiy Storchaka]

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

The change that will add a docstring to keyword.iskeyword() inevitable will have a negative performance effect. Is it worth it?

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nosy: +rhettinger, serhiy.storchaka

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