[issue24021] document urllib.urlretrieve

[Karl Richter]

Karl Richter added the comment:

> I suspect the complaint might be about the lack of doc string
Exactly. It'd be helpful to figure out the return value and the means of the function arguments in a more compact form than the referenced website docs and to have it available in the interpreter (with `help`), i.e. with docstring documentation.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24021>
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