[docs] [issue22725] improve documentation for enumerate() (built-in function)

[Terry J. Reedy]

Terry J. Reedy added the comment:

The first argument of enumerate is 'iterable' in the 2.7 docstring also.

"enumerate(iterable[, start]) -> iterator for index, value of iterable

Return an enumerate object.  iterable must be another object that supportsniteration.  The enumerate object yields pairs containing a count (from\nstart, which defaults to zero) and a value yielded by the iterable argument.  enumerate is useful for obtaining an indexed list:   (0, seq[0]), (1, seq[1]), (2, seq[2]), ..."

We should update at least that part of the doc entry.

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nosy: +terry.reedy
stage:  -> needs patch
versions:  -Python 3.6

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