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

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


Removed file: http://bugs.python.org/file30013/doc_codecs_impl.patch

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