Remove request for React Native example apps
Remove request for React Native example apps

We no longer want to maintain a list of external React Native
example apps, so this commit removes the request from the docs.
Maintaining a list of external links requires review/vet/approve/etc
overhead, and is not something we can devote time to right now
unforunately.

apollographql/apollo-client,apollostack/apollo-client,apollographql/apollo-client,apollostack/apollo-client,apollostack/apollo-client