[docs] [issue11633] Document that print may need explicit flushing

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

I agree with the python-ideas message that ``sys.stdout.flush()`` is surprising / possibly misleading and should be ``file.flush()``.  If the other bug report about adding a flush argument is rejected, please consider this.  Thanks :)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11633>
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