[docs] [issue35155] Clarify Protocol Handlers in urllib.request Docs

[Senthil Kumaran]

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

We could backport this to older versions too. This documentation change is helpful, and backporting this will help with future backport patches against these files.

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status: closed -> open

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<https://bugs.python.org/issue35155>
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