Update terrain_collision.adoc (#143)

docs/modules/core/pages/collision/terrain_collision.adoc

@@ -130,9 +130,10 @@ public class HelloTerrainCollision extends SimpleApplication
     TerrainLodControl control = new TerrainLodControl(terrain, cameras);
     terrain.addControl(control);
 
-    /** 6. Add physics: */
-    // We set up collision detection for the scene by creating a static
-    RigidBodyControl with mass zero.*/
+    /** 6. Add physics: 
+     * We set up collision detection for the scene by creating a static
+     * RigidBodyControl with mass zero.
+     */
     terrain.addControl(new RigidBodyControl(0));
 
     /**