Update terrain_editor.adoc

Made additional clarifications to creating a terrain.

src/docs/asciidoc/sdk/terrain_editor.adoc

@@ -22,7 +22,7 @@ Terrain controls are the same as the Scene Composer, you rotate the camera with
 
 == Creating Terrain
 
-To create terrain, first select the `Scene` directory under your `Project Assets` folder, right click and select `menu:New[Other>Scene>Empty jme3 Scene]`. This will generate an empty scene in that directory. Right click this new file and then select `Edit Terrain`. This will open the new file in the `TerrainEditor` and display your scenes file structure in the `SceneExplorer` located at the bottom left panel of the SDK. Select a node (probably your root node) in your scene. +
+To create terrain, first select the `Scene` directory under your `Project Assets` folder, right click and select `menu:New[Other>Scene>Empty jme3 Scene]`. This will generate an empty scene in that directory. Right click this new file and then select `Edit Terrain`. This will open the new file in the `TerrainEditor` and display your scenes file structure in the `SceneExplorer` located at the bottom left panel of the SDK. In the `SceneExplorer`, select a node (usually your root node) in your scene. +
 image:sdk/sdk-terrain-tut-selectnode.png[sdk-terrain-tut-selectnode.png,width="",height=""] +
 Then click the add terrain button. +
 image:sdk/sdk-terrain-tut-addterrain.png[sdk-terrain-tut-addterrain.png,width="",height=""] +