ENH: doxygen documentation updates

src/OpenFOAM/db/functionObjects/functionObject/functionObjectsDoc.H

@@ -21,6 +21,8 @@ License
     You should have received a copy of the GNU General Public License along with
     OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
 \defgroup grpFunctionObjects Function objects
 @{
     This group contains function objects