[docs] [issue31042] Inconsistency in documentation of operator.index

[R. David Murray]

R. David Murray added the comment:

I agree with Raymond.  I'm not sure that adding roughly is going to decrease the possibility of confusion, but I won't object to it.

In a way, it's too bad we didn't make the attribute lookup machinery look up all dunder methods on the class, so that a.__index__ would call the class method.  I think backward compatibility prevented that.

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nosy: +r.david.murray

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