[docs] [issue13386] Document documentation conventions for optional args

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

You should also explicitly specify what happens in several optional but not keyword args are needed. AFAIU the convention is:

   func(arg1, arg2[, opt1, opt2])

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<http://bugs.python.org/issue13386>
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