[docs] [issue16701] Docs missing the behavior of += (in-place add) for lists.

[R. David Murray]

R. David Murray added the comment:

Wording looks ok...except that technically it is not that 'n' is an integer, it's that 'n' can play the role of an integer (ie: it has an __index__ method).

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<http://bugs.python.org/issue16701>
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