docs on authority spec

ethcore/src/spec/spec.rs

@@ -268,6 +268,7 @@ impl Spec {
 	}
 
 	/// Create a new Spec with AuthorityRound consensus which does internal sealing (not requiring work).
+	/// Accounts with secrets "1".sha3() and "2".sha3() are the authorities.
 	pub fn new_test_round() -> Self {
 		Spec::load(include_bytes!("../../res/authority_round.json") as &[u8]).expect("authority_round.json is invalid")
 	}