[docs] [issue7447] Sum() doc and behavior mismatch

[Łukasz Langa]

Łukasz Langa <lukasz at langa.pl> added the comment:

The oldest interfaces tend to have quirks like that. Similar issue: #9379. Won't be changed as well. I'm thinking of a better docstring though.

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nosy: +lukasz.langa

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<http://bugs.python.org/issue7447>
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