[docs] [issue24021] Add docstring to urllib.urlretrieve

[Roundup Robot]

Roundup Robot added the comment:

New changeset 659f5adc2354 by Robert Collins in branch '3.4':
Issue #24021: docstring for urllib.urlcleanup.
https://hg.python.org/cpython/rev/659f5adc2354

New changeset 6fd69aeb8a3b by Robert Collins in branch '3.5':
Issue #24021: docstring for urllib.urlcleanup.
https://hg.python.org/cpython/rev/6fd69aeb8a3b

New changeset 43ed41cdd3c2 by Robert Collins in branch 'default':
Issue #24021: docstring for urllib.urlcleanup.
https://hg.python.org/cpython/rev/43ed41cdd3c2

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nosy: +python-dev

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