[docs] [issue33264] Remove to-be-deprecated urllib.request.urlretrieve function reference from HOWTO

[Senthil Kumaran]

Senthil Kumaran <senthil at uthcode.com> added the comment:

Andrés,  your pull request looks good to me. Please go ahead and sign the CLA and I can merge this to cpython HEAD. 

Thank you for your contribution.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33264>
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