Simplify comments of x/y/zAcceleration in PerceivedObject

    -- @details xAcceleration

    -- Relative acceleration of the detected object from the ITS-S's reference point in x-direction

    -- for the time of measurement. For a vehicle, the acceleration is reported in a body-fixed

    -- coordinate system as provided by ISO 8855. For a RSU, the acceleration is reported in a

    -- coordinate system in which the y-axis corresponds to the North direction, the x-axis to the

    -- East direction, and the z-axis to the vertical direction.

    -- coordinate system as provided by ISO 8855. For a RSU, the acceleration x-axis corresponds to

    -- the East direction.

    xAcceleration           Acceleration OPTIONAL,

    -- @details yAcceleration

    -- Relative acceleration of the detected object from the ITS-S's reference point in y-direction

    -- for the time of measurement. For a vehicle, the acceleration is reported in a body-fixed

    -- coordinate system as provided by ISO 8855. For a RSU, the acceleration is reported in a

    -- coordinate system in which the y-axis corresponds to the North direction, the x-axis to the

    -- East direction, and the z-axis to the vertical direction.

    -- coordinate system as provided by ISO 8855. For a RSU, the acceleration y-axis corresponds to

    -- the North direction.

    yAcceleration           Acceleration OPTIONAL,

    -- @details zAcceleration

    -- Relative acceleration of the detected object from the ITS-S's reference point in z-direction

    -- for the time of measurement. For a vehicle, the acceleration is reported in a body-fixed

    -- coordinate system as provided by ISO 8855. For a RSU, the acceleration is reported in a

    -- coordinate system in which the y-axis corresponds to the North direction, the x-axis to the

    -- East direction, and the z-axis to the vertical direction.

    -- coordinate system as provided by ISO 8855. For a RSU, the acceleration z-axis corresponds to

    -- the vertical direction.

    zAcceleration           Acceleration OPTIONAL,

    -- @details yawAngle

    -- Relative yaw angle of object from the ITS-S's reference point. For a vehicle, the angle is