message: Telemetry: add docstrings
diff: @@ -149,8 +149,8 @@ public:
  * coordinate system.
  */
  struct IMUReadingNED {
  - AccelerationNED acceleration;
  - AngularVelocityNED angular_velocity;
  + AccelerationNED acceleration; /**< @see AccelerationNED */
  + AngularVelocityNED angular_velocity; /** @see AngularVelocityNED */
  };
  /**
  