[issue17844] Add link to alternatives for bytes-to-bytes codecs

[Roundup Robot]

Roundup Robot added the comment:

New changeset 85e8414060b4 by Nick Coghlan in branch '3.3':
Issue 17844: Clarify meaning of different codec tables
http://hg.python.org/cpython/rev/85e8414060b4

New changeset 801567d6302c by Nick Coghlan in branch 'default':
Merge issue 17844 from 3.3
http://hg.python.org/cpython/rev/801567d6302c

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<http://bugs.python.org/issue17844>
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