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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The write_through argument was added only in 3.3. I think this is a good idea to pass `write_through = Py_True` when Py_UnbufferedStdioFlag is set. Using -u means that performance is not important (that is why this is not default behavior).

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue28647>
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