[issue29549] Improve docstring for str.index

[Raymond Hettinger]

Raymond Hettinger added the comment:

Serhiy, I'm not sure what you're referring to by "Just make docstrings in the style of of Argument Clinic descriptions".   For the time being, I would like the docstring to match that of str.find().  The point of the patch is to decouple the two.  

AC issues and migrations can wait.  At this point, AC adoption has been more disruptive that helpful in a number of cases.

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