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

[Éric Araujo]

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

Bug fixes include doc improvements, so 2.7 is fair game.

Thanks for your suggestion to not mention specific platforms.  Let’s just backport the 3.2 text.

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