[docs] minor docs typo

[Hinton, Scott (ESEA Space)]

Hello,

I found a minor typo near the end of this paragraph:
https://docs.python.org/2.7/library/functions.html?highlight=round#round

Inside the last parenthetical phrase it says
(so. for example,

I would venture to guess that we don't want the period after the "so".  Maybe a comma, maybe nothing, but probably not a period.

Enjoy,
Scott

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