fix link to physic image

docs/modules/tutorials/pages/beginner/beginner.adoc

@@ -11,7 +11,7 @@ To start writing your own projects, create a new file from the `BasicGame` templ
 Note that Test apps in this example project are not necessarily the recommended way to build an app with JME, they are just simple one class test case that showcase a feature.
 
 [.right]
-image::jme3/beginner/beginner-physics.png[beginner-physics.png,width="360",height="291"]
+image::beginner/beginner-physics.png[beginner-physics.png,width="360",height="291"]
 
 
 *  Make sure you are familiar with basic <<jme3/terminology#,3D game development concepts>> such as <<jme3/the_scene_graph#,the scene graph>>.

docs/modules/tutorials/pages/beginner/hello_physics.adoc

@@ -19,7 +19,7 @@ Apart from making models “solid, the most common use cases for physics in 3D g
 All these physical properties can be simulated in JME3. Let's have a look at a simulation of physical forces in this example where you shoot cannon balls at a brick wall.
 
 
-image::jme3/beginner/beginner-physics.png[beginner-physics.png,360,291,align="center"]
+image::beginner/beginner-physics.png[beginner-physics.png,360,291,align="center"]