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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The documentation should be updated before converting round() to Argument Clinic, because this update should be backported to 3.6 and 3.5, while the conversion can be made only in 3.7.

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keywords: +easy
stage:  -> needs patch

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