[docs] [issue11681] -b option undocumented

[Martin Panter]

Martin Panter added the comment:

As well as the usage string, it is missing from the list of options in the main documentation at Doc/using/cmdline.rst. There are a couple of places (sys.rst and warnings.rst) that reference :option:`-b`, and newer versions of Sphinx complain about this.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11681>
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