Update material_definitions.adoc

Fixed broken list continuation.

src/docs/asciidoc/jme3/advanced/material_definitions.adoc

@@ -53,24 +53,28 @@ In the <<jme3/advanced/materials_overview#,Materials Overview>> list:
 In your Java code,
 
 .  Create a Material object based on the chosen Material Definition (.j3md file): 
++
 [source,java]
 ----
 Material mat = new Material(assetManager, "Common/MatDefs/Misc/Unshaded.j3md");
 ----
 
 .  Configure your Material by setting the appropriate values listed in the <<jme3/advanced/materials_overview#,Materials Overview>> table. 
++
 [source,java]
 ----
 mat.setColor("Color", ColorRGBA.Yellow ); // and more
 ----
 
 .  Apply your prepared Material to a Geometry: 
++
 [source,java]
 ----
 myGeometry.setMaterial(mat);
 ----
 
 .  (Optional) Adjust the texture scale of the mesh: 
++
 [source,java]
 ----
 myGeometryMesh.scaleTextureCoordinates(new Vector2f(2f, 2f));