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

[Mark Dickinson]

Mark Dickinson added the comment:

[Serhiy]
> is it worth to mention explicitly that round(number) and round(number, None) > delegate to number.__round__()?

Yes, if we can find a non-clunky wording that does that. The current wording does seem to misleadingly suggest that the delegation to `__round__` only happens for the two-argument version of round.

How about just:

> For a general Python object ``number``, ``round`` delegates to
> ``number.__round__``.

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<http://bugs.python.org/issue30940>
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