add a comment for the tick as required by Simon

Source/WidgetInteraction/Private/WidgetInteraction.cpp

@@ -23,8 +23,8 @@ void FWidgetInteractionModule::ShutdownModule()
 
 void FWidgetInteractionModule::OnWorldTickStart(ELevelTick level_tick, float val)
 {
-  //called every Tick()
-
+	//since OnWorldTickStart is called independent of the world/level we are in, 
+	//we need to check whether the level changed and, if so, reattach the interaction component
 	auto worlds = GEngine->GetWorldContexts();
 
 	for (auto world_context : worlds) {