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

[Berker Peksag]

Berker Peksag <berker.peksag at gmail.com> added the comment:

Pull request for issue 30404 has been merged so we only need the documentation patch for the 3.6 branch (unfortunately 3.5 is now in security-fix-only mode) I've opened PR 3954.

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versions:  -Python 3.5, Python 3.7

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