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

[R. David Murray]

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

For the original report that this issue was opened for:

   Use keyword.iskeyword() to test for reserved identifiers such as "def" and "class".

The obvious replacement is:

   Use the iskeyword() function from the keyword module to test for reserved identifiers such as "def" and "class".

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nosy: +r.david.murray

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