message: Fix docs for unit_z on Vector3
diff: @@ -651,7 +651,7 @@ impl<S: BaseNum> Vector3<S> {
  Vector3::new(S::zero(), S::one(), S::zero())
  }
  - /// A unit vector in the `w` direction.
  + /// A unit vector in the `z` direction.
  #[inline]
  pub fn unit_z() -> Vector3<S> {
  Vector3::new(S::zero(), S::zero(), S::one())
  