Hmm, I'll remember consistency when working with the C implementation.  The Python that I've looked at seems to always use 4 spaces.  At any rate, here's a doc patch.  It essentially just makes "n bit integers" read "n bit positive integers".  Other than that, I can think of no way to update the docs to reflect the scope of this patch.

Thanks for everything, Guido!
File Added: bug_g119659_doc.patch