[issue2530] Document IO module

[Benjamin Peterson]

Benjamin Peterson <musiccomposition at gmail.com> added the comment:

Georg, I have a few questions:
Just out of curiosity, what did you change? Are their markup things I
missed or other things you're looking for that I just didn't get?

Are we going to want to push some of this stuff back into the docstrings?

Should I backport this to 2.6?

Mark: It has been checked in.

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nosy: +mark

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