Fix documenation typos.

Doxygen is smart enough to insert a period if the paragraph
before the @see directive, which starts a new section, doesn't
have one. Unfortunately it's not smart enough to convert a
comma to a period. So while the "description, @see foo" idiom
used for the CTL documentation scans well in the header file,
the Doxygen output end up with "description,.\n".

Minimal change to remove the offending commas.