[docs] [issue31153] Update docstrings of itertools functions

[Raymond Hettinger]

Raymond Hettinger added the comment:

Marking this as closed.  1) is being fixed elsewhere, 2) don't want to make func=None an official part of the API (it was a convenience for letting func default to the equivalent of operator.add), 3) already fixed, and 4) already fixed.

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resolution:  -> fixed
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31153>
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