[docs] itertools documentation does not link to source

[Georg Brandl]

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Am 19.09.2013 20:13, schrieb Thomas Winwood:
> Raymond Hettinger has spoken on how important it is to let people find the 
> source from the documentation, but there's no link from the itertools 
> documentation to the source.

Hi Thomas,

this is because the itertools module is written in C, and there's not much
that can be learned from that source (if you're not an expert, and know how
to find the source anyway).

cheers,
Georg
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