[issue4744] asynchat documentation needs to be more precise

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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versions: +Python 3.3, Python 3.4 -Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4744>
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