Update physics_listeners.adoc

src/docs/asciidoc/jme3/advanced/physics_listeners.adoc

@@ -13,9 +13,9 @@ You can control physical objects (push them around) by applying physical forces
 
 == Sample Code
 
-*  link:http://code.google.com/p/jmonkeyengine/source/browse/trunk/engine/src/test/jme3test/bullet/TestCollisionListener.java[TestCollisionListener.java]
-*  link:http://code.google.com/p/jmonkeyengine/source/browse/trunk/engine/src/test/jme3test/bullet/TestAttachGhostObject.java[TestAttachGhostObject.java]
-*  link:http://code.google.com/p/jmonkeyengine/source/browse/trunk/engine/src/test/jme3test/bullet/TestGhostObject.java[TestGhostObject.java]
+*  link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/bullet/TestCollisionListener.java[TestCollisionListener.java]
+*  link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/bullet/TestAttachGhostObject.java[TestAttachGhostObject.java]
+*  link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-examples/src/main/java/jme3test/bullet/TestGhostObject.java[TestGhostObject.java]
 
 
 == PhysicsGhostObjects