[issue2530] Document IO module

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

Looks good already! I can't review the full text now, but can you move
member documentation into the indented block for the class? (I know
other documents don't do this, but this is a legacy and I'd like new
documents to adopt this style.)

Additionally, the function description style is inconsistent ("Flushes
the stream" vs "Return this").

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nosy: +gvanrossum

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