STYLE: consistent use of '= delete' for removed constructors/assignments

- make the purpose more explicit, and reduces some work for the
  compiler as well.

src/OpenFOAM/db/functionObjects/regionFunctionObject/regionFunctionObject.H

@@ -135,10 +135,10 @@ private:
 
     // Private Member Functions
 
-        //- Disallow default bitwise copy construct
+        //- No copy construct
         regionFunctionObject(const regionFunctionObject&) = delete;
 
-        //- Disallow default bitwise assignment
+        //- No copy assignment
         void operator=(const regionFunctionObject&) = delete;