fix: menu docs
@@ -29,7 +29,7 @@ Create a `Menu` instance:
// here `"quit".to_string()` defines the menu item id, and the second parameter is the menu item label.
let quit = CustomMenuItem::new("quit".to_string(), "Quit");
let close = CustomMenuItem::new("close".to_string(), "Close");
-let submenu = Menu::new().add_item(quit).add_item(close);
+let submenu = Submenu::new("File", Menu::new().add_item(quit).add_item(close));
let menu = Menu::new()
.add_native_item(MenuItem::Copy)
.add_item(CustomMenuItem::new("hide", "Hide"))
