[issue13386] Document documentation conventions for optional args

[Eli Bendersky]

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

""So would it be worth the effort to identify each such place in the built-ins/stdlib and eventually change them all?  I've seen support for doing so in other tracker issues and think it's a good idea personally.""

Probably, if this will bring some added value in addition to being easier to document.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13386>
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