[docs] [issue12833] Document the need to pass the prompt to raw_input() with readline

[Martin Panter]

Changes by Martin Panter <vadmium+py at gmail.com>:


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stage: patch review -> needs patch
title: raw_input misbehaves when readline is imported -> Document the need to pass the prompt to raw_input() with readline
versions:  -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12833>
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