message: Fix group hash comment.
diff: @@ -6,10 +6,9 @@ use blake2_rfc::blake2s::Blake2s;
  /// the algorithm, for rigidity purposes.
  pub const FIRST_BLOCK: &'static [u8; 64] = b"0000000000000000002ffe76b973aabaff1d1557d79acf2c3795809c83caf580";
  -/// Produces an (x, y) pair (Montgomery) for a
  -/// random point in the Jubjub curve. The point
  -/// is guaranteed to be prime order and not the
  -/// identity.
  +/// Produces a random point in the Jubjub curve.
  +/// The point is guaranteed to be prime order
  +/// and not the identity.
  pub fn group_hash<E: JubjubEngine>(
  tag: &[u8],
  personalization: &[u8],
  