Update GettingStarted.md (#954)

Valid example URL

Author: nirajniroula

website/docs/GettingStarted.md

@@ -99,4 +99,4 @@ test('form submits two answers', () => {
 });
 ```
 
-You can find the source of `QuestionsBoard` component and this example [here](https://github.com/callstack/react-native-testing-library/blob/main/src/__tests__/questionsBoard.test.js).
+You can find the source of `QuestionsBoard` component and this example [here](https://github.com/callstack/react-native-testing-library/blob/main/src/__tests__/questionsBoard.test.tsx).