[docs] [issue28197] range.index mismatch with documentation

[Raymond Hettinger]

Raymond Hettinger added the comment:

> These broke some concrete Sequence implementations.

Poor choice of words.  The concrete implementations didn't change at all. 

Perhaps the concrete implementation need to be brought more in-sync with the ABC.  That would be reasonable; afteralll the goal is substitutability  -- that is the only reason that the old xrange morphed into something with nearly useless count() and index() methods in the first place.

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<http://bugs.python.org/issue28197>
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