More cleanup on headers/source for doxygen

- it also found things like size_t instead of size_type in fileName class

src/OpenFOAM/db/functionObjectList/functionObjectList.H

@@ -29,6 +29,9 @@ Description
     List of function objects with execute function which is called for
     each object.
 
+See Also
+    Foam::functionObject and Foam::OutputFilterFunctionObject
+
 SourceFiles
     functionObjectList.C