[docs] [issue22702] to improve documentation for join() (str method)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

A reference to the iterable term was added in issue7116 when str.join() started accepting arbitrary iterables rather than just sequences.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22702>
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