Updated _STEERING_ANGLE properties HAL docs with steering wheel info

Bug: 316947825
Bug: 316948592
Test: presubmit
Change-Id: I0b63bcc112f32a627b50c28126ae4b6882c5597d
diff --git a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
index 245baeb..6f4c607 100644
--- a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
+++ b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
@@ -254,6 +254,10 @@
      *
      * Angle is in degrees.  Left is negative.
      *
+     * This property is independent of the angle of the steering wheel. This property must
+     * communicate the angle of the front wheels with respect to the vehicle, not the angle of the
+     * steering wheel.
+     *
      * @change_mode VehiclePropertyChangeMode.CONTINUOUS
      * @access VehiclePropertyAccess.READ
      * @unit VehicleUnit.DEGREES
@@ -266,6 +270,10 @@
      *
      * Angle is in degrees.  Left is negative.
      *
+     * This property is independent of the angle of the steering wheel. This property must
+     * communicate the angle of the rear wheels with respect to the vehicle, not the angle of the
+     * steering wheel.
+     *
      * @change_mode VehiclePropertyChangeMode.CONTINUOUS
      * @access VehiclePropertyAccess.READ
      * @unit VehicleUnit.DEGREES