change to xref

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

@@ -188,7 +188,7 @@ Texture splatting allows you create a custom material, and '`paint textures`' on
 
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-The jMonkeyEngine SDK comes with a <<sdk/terrain_editor#,TerrainEditor plugin>>. Using the TerrainEditor plugin, you can sculpt the terrain with the mouse, and save the result as heightmap. You can paint textures on the terrain and the plugin saves the resulting splat textures as alphamap(s). The following paragraphs describe the manual process for you. You can choose to create the terrain by hand, or using the <<sdk/terrain_editor#,TerrainEditor plugin>>.
+The jMonkeyEngine SDK comes with a xref:ROOT:sdk/terrain_editor.adoc[TerrainEditor plugin]. Using the TerrainEditor plugin, you can sculpt the terrain with the mouse, and save the result as heightmap. You can paint textures on the terrain and the plugin saves the resulting splat textures as alphamap(s). The following paragraphs describe the manual process for you. You can choose to create the terrain by hand, or using the <<sdk/terrain_editor#,TerrainEditor plugin>>.
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