Update SpatialProcessingSurfaceMagnetism.md

Author: cre8ivepark

Assets/HoloToolkit-Examples/SpatialMapping/SpatialProcessingSurfaceMagnetism.md

@@ -21,7 +21,7 @@ You need to assign same Unity layer to the Spatial mapping’s plane and Solver
 2. In SpatialMapping prefab, make sure to set the Physics Layer to 31.
 <img src="/External/ReadMeImages/MRTK_SurfaceMagnetism5.png" width="550">
 
-3. Assign SolverSurfaceMagnetism script to an object. In Magnetic Surface option, select the new layer (SpatialProcessingPlane) that you created. 
+3. Assign SolverSurfaceMagnetism script to an object. In Magnetic Surface option, select the new layer **SpatialMapping** that you created. 
 <img src="/External/ReadMeImages/MRTK_SurfaceMagnetism6.png" width="550">
 
 4. After initial room scanning, you will be able to see MRTK logo plane is smoothly snapping to the surfaces.