[docs] [issue23787] sum() function docstring lists arguments incorrectly

[Raymond Hettinger]

Raymond Hettinger added the comment:

I believe this is just a 2.7 issue.

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versions:  -Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue23787>
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