[docs] [issue21667] Clarify status of O(1) indexing semantics of str objects

[Nick Coghlan]

Nick Coghlan added the comment:

I've merged the character->code point clarifications, without the implementation detail section.

For the time being, that leaves "doesn't provide O(1) indexing of strings" as the kind of discrepancy that often makes an appearance in "differences from the CPython reference implementation" section that many alternative implementations include.

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resolution:  -> later
stage:  -> resolved
status: open -> closed
type:  -> enhancement

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<http://bugs.python.org/issue21667>
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