[docs] There is a spelling mistakes in Python source code

[Georg Brandl]

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Am 08.08.2013 14:48, schrieb 张佩佩:
> Hello: I found there is a spelling mistakes in Python source code comment. 
> In file: Python\lib\_pyio.py Line 413: """closed: bool.  True iff the file
> has been closed. Best regards! peipei

Hi peipei,

this is in fact not a mistake; "iff" is a common abbreviation for
"if and only if".

cheers,
Georg
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