Summary:
The current example of `Objective-C/Swift` component will not work cos of wrong module name in the example. If change `MyReactNativeApp` to the `RNHighScores` everything starts working.
[DOCS] [BUGFIX] [IntegrationWithExistingApps.md] - Wrong module name in the example.
Closes https://github.com/facebook/react-native/pull/16675
Differential Revision: D6241675
Pulled By: hramos
fbshipit-source-id: d1ce8764399c4589d99060fba726aae0a379f183