movingWallVelocityFvPatchVectorField: Removed incorrect documentation concerning MRF

Resolves bug-report http://bugs.openfoam.org/view.php?id=2287

src/finiteVolume/fields/fvPatchFields/derived/movingWallVelocity/movingWallVelocityFvPatchVectorField.H

@@ -29,8 +29,7 @@ Group
 
 Description
     This boundary condition provides a velocity condition for cases with
-    moving walls.  In addition, it should also be applied to 'moving' walls
-    for moving reference frame (MRF) calculations.
+    moving walls.
 
 Usage
     Example of the boundary condition specification: