More accurate definition for node root field in Star Wars example comments
More accurate definition for node root field in Star Wars example comments

Summary: I'm not sure if this is right, feel free to discard. The `id` input argument to the `nodeField` query type seems to be an `ID!` as indicated in graphql-relay-js [here](https://github.com/graphql/graphql-relay-js/blob/9e7401450c2458c6a45048a049c785100f3a622b/src/node/node.js#L68). If I understand it correctly, the node query type can only be fetched using a base64 unique ID? It would then be more accurate to label the `nodeField` type as `node(id: ID!): Node`.
Closes https://github.com/facebook/relay/pull/501

Reviewed By: yungsters

Differential Revision: D2572524

fb-gh-sync-id: ecae7baa798d19864eccfe221cd64ceac94e3923

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