Clarify use of GraphQL for mobile app interfaces only when using React/Redux

From a conversation on Rocket

> The only place for GraphQL in my rule ebook is between the backend and the mobile app .. the mobile app api. Tthat api is mobile app specific .. and it makes sense to leverage the whole power of the React/Redux stack in that case BUT that is not the same API as for instance a partner API or a public API or an integration API
