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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

In 3.4 round() doesn't accept None as ndigits argument. The behavior was changed by issue19933 and issue27936. Wasn't this change a mistake? Seems Mark opposed to it.

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nosy: +mark.dickinson, rhettinger, serhiy.storchaka, steve.dower
versions: +Python 3.7

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