change cell content to space beter

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

@@ -241,10 +241,10 @@ a| Create a Spatial.
 a| Create a Mesh shape, wrap it into a Geometry, and give it a Material. For example:
 [source,java]
 ----
-Box mesh = new Box(Vector3f.ZERO, 1, 1, 1); // a cuboid default mesh
+// a cuboid default mesh
+Box mesh = new Box(Vector3f.ZERO, 1, 1, 1);
 Geometry thing = new Geometry("thing", mesh);
-Material mat = new Material(assetManager,
-   "Common/MatDefs/Misc/ShowNormals.j3md");
+Material mat = new Material(assetManager, "Common/MatDefs/Misc/ShowNormals.j3md");
 thing.setMaterial(mat);
 ----