Make docs set control_flow in a more realistic way (#1376)

README.md

@@ -46,12 +46,14 @@ fn main() {
     let window = WindowBuilder::new().build(&event_loop).unwrap();
 
     event_loop.run(move |event, _, control_flow| {
+        *control_flow = ControlFlow::Wait;
+
         match event {
             Event::WindowEvent {
                 event: WindowEvent::CloseRequested,
                 window_id,
             } if window_id == window.id() => *control_flow = ControlFlow::Exit,
-            _ => *control_flow = ControlFlow::Wait,
+            _ => (),
         }
     });
 }