[docs] [issue19548] 'codecs' module docs improvements

[Jan Kaliszewski]

Jan Kaliszewski added the comment:

11. Ad encoding 'undefined': The sentence `Can be used as the system encoding if no automatic coercion between byte and Unicode strings is desired.` was suitable for Python 2.x, but not for Python 3.x'. I believe, this sentence should be removed.

----------

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19548>
_______________________________________