change link to piont to image in tutorail mod

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

@@ -155,7 +155,7 @@ The first step of terrain creation is the heightmap. You can create one yourself
 *  Save the map as a .jpg or .png image file
 
 [.right.text-left]
-image::jme3/beginner/mountains512.png[mountains512.png,128,128,align="right"]
+image::beginner/mountains512.png[mountains512.png,128,128,align="right"]
 
 The file `mountains512.png` that you see here is a typical example of an image heightmap.