docs: use native-stack in navigation-container

Author: kacperkapusciak

versioned_docs/version-6.x/navigation-container.md

@@ -16,9 +16,9 @@ Usage:
 
 ```js
 import { NavigationContainer } from '@react-navigation/native';
-import { createStackNavigator } from '@react-navigation/stack';
+import { createNativeStackNavigator } from '@react-navigation/native-stack';
 
-const Stack = createStackNavigator();
+const Stack = createNativeStackNavigator();
 
 export default function App() {
   return (