Added recommendation to use shallow rendering or jest.mock()

content/docs/addons-test-utils.md

@@ -114,7 +114,7 @@ Pass a mocked component module to this method to augment it with useful methods
 
 > Note:
 >
-> `mockComponent()` is a legacy method that is no longer needed. A similar pattern can be implemented directly.
+> `mockComponent()` is a legacy API. We recommend using [shallow rendering](/docs/test-utils.html#shallow-rendering) or [jest.mock()](https://facebook.github.io/jest/docs/en/tutorial-react-native.html#mock-native-modules-using-jestmock) instead.
 
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