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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Not a bad idea.

How about implementation? Here is updated patches for 3.x and 2.7. Note that in 2.7 I split codecs table as in 3.x.

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Added file: http://bugs.python.org/file30331/doc_codecs_impl.patch

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