[issue29549] Improve docstring for str.index

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I mean that this work is useless since it will be lost when convert str.index to Argument Clinic. Well, even when don't use Argument Clinic, but make str.index() be supported by inspect.signature(), the docstring should be significantly rewritten.

I think there are many other easy documentation issues for practicing.

And all proposed PRs change only the docstring of str.index. They don't touch docstrings of str.rindex, bytes.index, bytes.rindex, bytearray.index and bytearray.rindex. I can't approve such changes.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29549>
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