[docs] [issue22797] urllib.request.urlopen documentation falsely guarantees that a URLError will be raised on errors

[Alexander Liu]

Alexander Liu added the comment:

Fixed the docs to specifically note that only protocol related errors raise the UrlError exception.

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nosy: +alex_thebear
versions: +Python 3.6 -Python 3.4
Added file: http://bugs.python.org/file43131/urlopen_doc.patch

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