[docs] [issue16011] "in" should be consistent with return value of __contains__

[Mark Dickinson]

Mark Dickinson added the comment:

There was a related discussion on python-ideas a while back:

http://mail.python.org/pipermail/python-ideas/2010-July/007733.html

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nosy: +mark.dickinson

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16011>
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