Doxygen formatting fixups

- Fix minor typos and comment syntax in header
- Disable top nav bar (we already have one on the side)
- Disable "Dynamic" sections - this allows the file size to be smaller
  and the load time quicker
- Disable "Search" functionality - this just generates a whole bunch of
  files, and it's nothing an index lookup can't solve

Change-Id: Ie6628d5ca876c2098986eff2c87d7501ef44a784
Reviewed-on: http://review.couchbase.org/39279
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>