[issue22128] patch: steer people away from codecs.open

[Antoine Pitrou]

Antoine Pitrou added the comment:

> I don't think it's useful to tell people:
> * use codecs.open() on Python 2.4, 2.5, 2.6
> * use io.open() on Python 2.7 (io is too slow on 2.6 to be a real alternative to codecs.open())
> * use open() on Python 3.4+

Instead we can tell them to use io.open() on all versions from 2.7 and upwards.
2.6 is dead and won't receive any documentation updates anyway.

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nosy: +pitrou

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<http://bugs.python.org/issue22128>
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