[docs] [issue13510] Clarify that readlines() is not needed to iterate over a file

[Ezio Melotti]

Changes by Ezio Melotti <ezio.melotti at gmail.com>:


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nosy: +eric.araujo, ezio.melotti
stage:  -> needs patch
versions: +Python 2.7, Python 3.2, Python 3.3

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<http://bugs.python.org/issue13510>
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