[docs] [issue15831] comma after leading optional argument is after bracket in docs

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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keywords: +easy
nosy: +ezio.melotti
stage:  -> needs patch
versions: +Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15831>
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