Add new AssetImporter flag to Doxygen docs.

Docs/Reference.dox

@@ -3073,6 +3073,7 @@ Options:
 -bp         Move bones to bind pose before saving model
 -split <start> <end> (animation model only)
             Split animation, will only import from start frame to end frame
+-np         Do not suppress $fbx pivot nodes (FBX files only)
 \endverbatim
 
 The material list is a text file, one material per line, saved alongside the Urho3D model. It is used by the scene editor to automatically apply the imported default materials when setting a new model for a StaticModel, StaticModelGroup, AnimatedModel or Skybox component, and can also be manually invoked by calling \ref StaticModel::ApplyMaterialList "ApplyMaterialList()". The list files can safely be deleted if not needed.

Source/Tools/AssetImporter/AssetImporter.cpp

@@ -311,7 +311,7 @@ void Run(const Vector<String>& arguments)
             "-bp         Move bones to bind pose before saving model\n"
             "-split <start> <end> (animation model only)\n"
             "            Split animation, will only import from start frame to end frame\n"
-            "-np         Do not suppress $fbx pivot nodes (fbx files only)\n"
+            "-np         Do not suppress $fbx pivot nodes (FBX files only)\n"
         );
     }