avoid using unimplemented input method

docs/beginner/tutorial2-surface/README.md

@@ -327,9 +327,7 @@ We call this method `run()` in the event loop for the following events.
 ```rust
 match event {
     // ...
-
-    } if window_id == state.window().id() => if !state.input(event) {
-        match event {
+    } if window_id == state.window().id() => match event {
         // ...
 
         WindowEvent::Resized(physical_size) => {
@@ -341,7 +339,7 @@ match event {
         }
         // ...
     }
-    }
+    // ...
 }
 ```