fix xrefs

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

@@ -140,7 +140,7 @@ rootNode.attachChild(wall);
 
 ----
 
-In this case, you xref:ROOT:tutorials:beginner/hello_material.adoc[create your own Material] and apply it to a Geometry. You base Materials on default material descriptions (such as "`Unshaded.j3md`"), as shown in this example.
+In this case, you xref:beginner/hello_material.adoc[create your own Material] and apply it to a Geometry. You base Materials on default material descriptions (such as "`Unshaded.j3md`"), as shown in this example.
 
 
 === Loading Text and Fonts