[docs] [issue8619] Doc bug for urllib.request._urlopener in Python 3.1+

[Senthil Kumaran]

Senthil Kumaran <orsenthil at gmail.com> added the comment:

Actually, I see certain use-cases of _urlopener in py3k. Most visible one being urllib.request.urlretrieve and also URLOpener.open which is different from build_opener way of doing things.

- But still, public exposure of overriding globals to can be removed. There is no harm in the functionality. In py3k, users should resort to build_opener style of doing than use FancyURLOpener or URLOpener which are present for backward compatibility reasons only.

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