Modified Amonition tip.

src/docs/asciidoc/jme3/external/blender.adoc

@@ -221,14 +221,15 @@ To do this, go to the Blender Node Window
 **  image:jme3/external/ready_normal.gif[ready_normal.gif,width="",height=""]
 
 [TIP]
+.Inverting Tips
 ====
-Note that the link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-core/src/main/resources/Common/MatDefs/Light/PBRLighting.j3md#L40[PBR material] has a NormalType parameter that allows one to handle this in the shader instead of having to edit the normal map.
+If you build the engine from source, the master branch link:https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-core/src/main/resources/Common/MatDefs/Light/PBRLighting.j3md#L39[PBR material] has a NormalType parameter that allows one to handle this in the shader instead of having to edit the normal map.
 
 You can also use the SDK to invert the channel:
 
 .  In the SDK, btn:[RMB] select the image and choose "`Edit Texture`".
 .  In the window header, press the btn:[Filters] button and choose `menu:Invert[Green]`.
-.  When satisfied, save the change in the same format as the original image using `menu:File[Save]`.  
+.  When satisfied, save the change in the same format as the original image using `menu:File[Save]`.
 ====
 
 === LightMap baking