minor: expand upon comments about not scheduling two full updates for attachments

OpenSim/Region/CoreModules/Framework/InventoryAccess/InventoryAccessModule.cs

@@ -502,8 +502,9 @@ namespace OpenSim.Region.CoreModules.Framework.InventoryAccess
                         group.RootPart.IsAttachment = true;
                     }
 
-                    // For attachments, we must make sure that only a single object update occurs after we've finished
-                    // all the necessary operations.
+                    // If we're rezzing an attachment then don't ask AddNewSceneObject() to update the client since
+                    // we'll be doing that later on.  Scheduling more than one full update during the attachment
+                    // process causes some clients to fail to display the attachment properly.
                     m_Scene.AddNewSceneObject(group, true, false);
 
                     //  m_log.InfoFormat("ray end point for inventory rezz is {0} {1} {2} ", RayEnd.X, RayEnd.Y, RayEnd.Z);