[docs] [issue37974] zip() docstring should say 'iterator' instead of 'object with __next__()'

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan <tir.karthi at gmail.com>:


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nosy: +rhettinger
type:  -> behavior

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37974>
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