[docs] [issue30940] Documentation for round() is incorrect.

[R. David Murray]

R. David Murray added the comment:

We don't need to burden Mark with doing a PR for this (unless he wants to).  This is a good new contributer practice issue :)

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nosy: +r.david.murray

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30940>
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