[Javadoc] Need to clearly document the effect of SceneAntialiasing on 2D primitives

Scene has a constructor that takes the SceneAntialiasing argument and a getter for the value getAntiAliasing. Setting it to DISABLED does not disable antialiasing on 2D scene. This should be either fixed (in which case I'd be concerned about the default value being DISABLED) or it should be clearly stated in the documentation that it takes effect in 3D only (which doesn't seem really intuitive and there are users out there who want to switch antialiasing off in 2D).