[docs] [issue28088] Document Transport.set_protocol and get_protocol

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

I added a note like this. 


.. note::
   Switching protocol should only be done when both protocols are
   documented to support the switch.


Would this work? Would appreciate any feedback of how to properly document this behavior.

Thanks.

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Added file: http://bugs.python.org/file45247/issue28088v2.patch

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