PATCH: Typo fixes, as found by doxygen.log

[Jesse Weinstein]

The log of warnings from doxygen, doxygen.log, is actually quite useful.
Here's a patch fixing various typos I found by looking through those
warnings.  There are lots more to do...  Hopefully they should all be
obvious once seen, but if not, I'll be glad to explain any of them in
more detail.

Jesse Weinstein
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