[docs] [issue33014] Clarify doc string for str.isidentifier()

[Terry J. Reedy]

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

No new string method ;-).  "Call function keyword.iskeyword() ..." should make it clear that iskeyword is not a string method.  Samyam, I suggest getting agreement on new wording first.  Then do PR that is more or less 'pre-approved'.

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nosy: +terry.reedy

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