fix missing return statement

Author: AnCichocka

versioned_docs/version-7.x/testing.md

@@ -29,9 +29,9 @@ To add the mocks, create a file `jest/setup.js` (or any other file name of your
 import 'react-native-gesture-handler/jestSetup';
 
 // Include this section for mocking react-native-reanimated
-jest.mock('react-native-reanimated', () => {
-  require('react-native-reanimated/mock');
-});
+jest.mock('react-native-reanimated', () =>
+  require('react-native-reanimated/mock')
+);
 
 // Silence the warning: Animated: `useNativeDriver` is not supported because the native animated module is missing
 jest.mock('react-native/Libraries/Animated/NativeAnimatedHelper');