message: corrects typo in the comments
diff: @@ -170,7 +170,7 @@ void CartesianImpedanceExampleController::update(const ros::Time& /*time*/,
  Eigen::Matrix<double, 6, 1> error;
  error.head(3) << position - position_d_;
  - // prientation error
  + // orientation error
  // "difference" quaternion
  Eigen::Quaterniond error_quaternion(orientation * orientation_d_.inverse());
  // convert to axis angle
  