minor error in patch.py's extract() docstring

[Dan Drake]

Hello,

In mercurial/patch.py, the function extract() claims to return a tuple
with 7 elements, but it actually returns a tuple with 8 elements -- it
also returns the branch if found. I'm attaching a patch to fix that.

Please CC me in any replies, as I'm not subscribed to the list.

Thanks!

Dan

PS: I find it amusing that the function I'm patching is the very one
that will process the patch file I've attached. :)

--
---  Dan Drake
-----  http://mathsci.kaist.ac.kr/~drake
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