[docs] [issue16774] Additional recipes for itertools docs

[Alexey Kachayev]

Alexey Kachayev added the comment:

Updated patch with:
* fix error in islice function name
* made n=None default second argument for consume(iterator, n=None) cause it provides specific behavior when n is None which can be assumed as default for function

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Added file: http://bugs.python.org/file28768/itertools.doc.v3.diff

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<http://bugs.python.org/issue16774>
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