STYLE: Documentation updates

src/functionObjects/utilities/systemCall/systemCall.H

@@ -35,6 +35,7 @@ Description
     - every output time
     - end of the calculation
 
+Usage
     Example of function object specification:
     \verbatim
     systemCall1
@@ -59,7 +60,7 @@ Description
     }
     \endverbatim
 
-Usage
+    Where the entries comprise:
     \table
         Property     | Description              | Required    | Default value
         type         | type name: systemCall    | yes         |