[docs] [issue31270] Simplify documentation of itertools.zip_longest

[R. David Murray]

R. David Murray added the comment:

Thanks for wanting to improve the documentation.

Raymond will address this definitively, but unless I'm mistaken part of the purpose of the examples is to show how the various itertools can be used.  If that is true, then in the context of the overall itertools documentation I think the current example has more teaching value than your suggested revision.

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nosy: +r.david.murray

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<http://bugs.python.org/issue31270>
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