Documentation Error

I am trying to follow the supplied documentation that comes with TGB, however I have run into a problem with the Fish Demo tutorial :
"

function FishClass::onWorldLimit(%this, %mode, %limit)
{
   switch$ (%limit)
   {
      case "left":
         %this.setLinearVelocityX(20);
         %this.setFlipX(false);
      
      case "right":
         %this.setLinearVelocityX(-20);
         %this.setFlipX(%flipX)(true);
   }
}

We need to add a call to both the "left" and "right" responses. This call will set the fish's Y position in a random number between the top of the level and just above the ground. Make your function look like this.

function FishClass::onWorldLimit(%this, %mode, %limit)
{
   switch$ (%limit)
   {    
      case "left":
         %this.setLinearVelocityX(20);
         %this.setFlipX(false);
      case "right":
         %this.setLinearVelocityX(-20);
         %this.setFlipX(true);
    }
}

Code Sample 6.1.1
"
....As you can see this is supposed to make the fish reach the world limits, then come back across the screen at a different location on the Y axis. The code is identical apart from one white line was removed. I did a search on the forums, but can't find what to do.

Anyone have any ideas?
-Thanks in advance.