Move glTF export option under Scene menu in Exporting 3D scenes (#5715)

Co-authored-by: Hugo Locurcio <[email protected]>

tutorials/3d/using_gridmaps.rst

@@ -65,7 +65,7 @@ library. Materials set on the node will be ignored.
 Exporting the MeshLibrary
 -------------------------
 
-To export the library, click on Scene -> Convert To.. -> MeshLibrary.., and save it
+To export the library, click on **Scene > Export As... > MeshLibrary...**, and save it
 as a resource.
 
 .. image:: img/gridmap_export.png

tutorials/assets_pipeline/exporting_3d_scenes.rst

@@ -16,7 +16,7 @@ program such as Blender, and then bring it back into Godot.
 
     Only Blender 2.83 and newer can import glTF files exported by Godot.
 
-To export a scene in the editor go to **Project > Tools > Export GLTF...**
+To export a scene in the editor go to **Scene > Export As... > glTF 2.0 Scene...**
 
 .. image:: img/gltf_godot_export.png