[issue28647] python --help: -u is misdocumented as binary mode

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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nosy: +berker.peksag
stage:  -> patch review
type:  -> behavior
versions: +Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28647>
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