[issue2530] Document IO module

[Georg Brandl]

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

Other than the "class.method" change you already noticed, I changed some
"method"s to "attribute"s (since they are @propertied in the source),
removed parens in :meth:`` roles, moved the constructor description into
the .. class block and did some spelling corrections.

A backport to 2.6 would be great. If you also find time to put some
docstrings in, very good.

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