docs(cookbook/graphql): Add store id resolution

Author: Urigo

public/docs/_examples/heroes-graphql/ts/app/client.ts

@@ -3,6 +3,7 @@ import ApolloClient, { createNetworkInterface } from 'apollo-client';
 import { networkInterface } from './in-memory-graphql';
 
 export const client = new ApolloClient({
-  networkInterface
+  networkInterface,
+  dataIdFromObject: (object:any) => object.id,
 });
 // #enddocregion