[issue19548] 'codecs' module docs improvements

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0646eee8296a by Nick Coghlan in branch '3.4':
Issue 19548: update codecs module documentation
https://hg.python.org/cpython/rev/0646eee8296a

New changeset 4d00d0109147 by Nick Coghlan in branch 'default':
Merge issue 19548 changes from 3.4
https://hg.python.org/cpython/rev/4d00d0109147

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nosy: +python-dev

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