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

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.

---------- nosy: +pitrou

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