[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 _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue22128> _______________________________________