Automatically clean up memory associated with events

docs/README-main-functions.md

@@ -175,9 +175,8 @@ int SDL_AppEvent(const SDL_Event *event);
 ```
 
 This will be called whenever an SDL event arrives, on the thread that runs
-SDL_AppIterate. You should not call SDL_CleanupEvent() on the provided
-event, and your app should also not call SDL_PollEvent, SDL_PumpEvent, etc,
-as  SDL will manage all this for you. Return values are the same as from
+SDL_AppIterate.  Your app should also not call SDL_PollEvent, SDL_PumpEvent,
+etc, as  SDL will manage all this for you. Return values are the same as from
 SDL_AppIterate(), so you can terminate in response to SDL_EVENT_QUIT, etc.