[docs] [issue18220] In itertools.islice() make prototype like in help()

[A.M. Kuchling]

A.M. Kuchling added the comment:

This bug is entirely too cryptic.  What exactly is the problem you're trying to fix?

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nosy: +akuchling

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18220>
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