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

[Nick Coghlan]

Nick Coghlan added the comment:

I like this, both because it quite clearly defines the encode and decode directions, and allows notes the more direct entry points if the codec isn't being specified as an input string.

So +1 from me.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17844>
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