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

[Mark Lawrence]

Mark Lawrence added the comment:

Could they be documented with a massive warning in red "Cpython implementation detail - subject to change without notice"?  Or documented in a place that is only accessible to developers and not users?  Or...???

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nosy: +BreamoreBoy

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<http://bugs.python.org/issue19548>
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