set text under image

docs/modules/ROOT/pages/jme3/advanced/terrain.adoc

@@ -79,19 +79,25 @@ The default material for TerraMonkey is TerrainLighting.j3md. This material comb
 We recommend to <<sdk/terrain_editor#,create and edit Splat Textures for terrains visually in the jMonkeyEngine SDK>>, and not do it manually. If you are simply curious about how the SDK's terrain texture plugin works, or if you indeed want to generate materials manually, then read on for the implementation details.
 ====
 
+
 .diffuse
 image::tutorials:beginner/road.jpg[road.jpg,width="",height=""]
+
+The Diffuse Map of one of the terrain textures depicts the colors of a paved surface.
+
 .normal
 image::tutorials:beginner/road_normal.png[road_normal.png,width="",height=""]
-.heightmap
-image::tutorials:beginner/mountains512.png[mountains512.png,width="128",height="128"]
-.alphamap
-image::tutorials:beginner/alphamap.png[alphamap.png,width="128",height="128"]
 
 The Diffuse Map of one of the terrain textures depicts the colors of a paved surface.
 
+.heightmap
+image::tutorials:beginner/mountains512.png[mountains512.png,width="128",height="128"]
+
 The Normal Map of one of the terrain textures depicts the bumpiness of a paved surface.
 
+.alphamap
+image::tutorials:beginner/alphamap.png[alphamap.png,width="128",height="128"]
+
 A heightmap encodes the topological highs and lows of the terrain.
 
 An alpha map can describe where 4 textures are painted onto the terrain.