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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Then perhaps we need notes about algorithmic complexity of bytes, bytearray, list and tuple and dict indexing, set.add and set.discard, dict.__delitem__, list.pop, len(), + and += for all basic sequences and containers, memoryview() for bytes, bytearray and array.array, etc, etc.

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nosy: +serhiy.storchaka

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