[docs] [issue11681] -b option undocumented

[Martin Panter]

Martin Panter added the comment:

Try this to trigger a warning:

python2 -b -c 'bytearray("3") == u"3"'
-c:1: BytesWarning: Comparison between bytearray and string

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nosy: +vadmium

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<http://bugs.python.org/issue11681>
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