[issue1631394] sre module has misleading docs

[Tom Lynn]

Tom Lynn added the comment:

Thanks for fixing this. I now also note that (?<=...), (?<!...) and (?
(id/name)yes-pattern|no-pattern) aren't documented, and nor is finditer 
in the main docstring.

The attached patch fixes these, as well as what looks like mistaken 
formatting on one line. Some of the proposed lines are a bit long for 
help(re), but they're hard to shorten.

Added file: http://bugs.python.org/file9284/undoc-patch.txt

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