[issue29549] Improve docstring for str.index

[Sanyam Khurana]

Sanyam Khurana added the comment:

Mariatta, I apologize for this. I completely missed to see that this was already assigned to someone else.

I've withdrawn my PR.

Thanks.

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nosy: +CuriousLearner

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<http://bugs.python.org/issue29549>
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