LU-4975 ofd: Fix Doxygen warnings for ofd files

LU-4975 ofd: Fix Doxygen warnings for ofd files

After patches 10417 and 10586, some Doxygen warnings were created
due to incorrect syntax and missing function parameters in header.
This patch fixes those warnings.

Signed-off-by: Doug Oucharek <doug.s.oucharek@intel.com>
Change-Id: I6859d9cbe17f52562ae1e93ea4fa0afb08b3f547
Reviewed-on: http://review.whamcloud.com/12665
Tested-by: Jenkins
Reviewed-by: Richard Henwood <richard.henwood@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Johann Lombardi <johann.lombardi@intel.com>