message: or or -> or a.
diff: @@ -43,7 +43,7 @@ use num::BaseFloat;
  /// Note that while [Euler angles] are intuitive to define, they are prone to
  /// [gimbal lock] and are challenging to interpolate between. Instead we
  /// recommend that you convert them to a more robust representation, such as a
  -/// quaternion or or rotation matrix. To this end, `From<Euler<A>>` conversions
  +/// quaternion or a rotation matrix. To this end, `From<Euler<A>>` conversions
  /// are provided for the following types:
  ///
  /// - [`Basis3`](struct.Basis3.html)
  