[docs] Typo in callable doc

[Georg Brandl]

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Am 14.05.2010 19:08, schrieb Éric Araujo:
> Hello
> 
> Revision 77096 fixed a bug in Doc/library/2to3.rst by changing
> “hasattr(x, "__call_")” to “isinstance(x, collections.Callable)”.
> However, in the 2.6 documentation still visible at docs.python.org, the
> incorrect “__call_” is still present.

Fixed to __call__ for now.  Don't know if Benjamin will the fix for the
fixer to 2.6.

Georg
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