Updated SEAT_EASY_ACCESS_ENABLED HAL docs to specify meaning of areaId.

Bug: 262740299
Test: manual build
Change-Id: If6c5b06ba4ecd83485bf593e64254507deaf6caf
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 b628b60..b5fb5b6 100644
--- a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
+++ b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/VehicleProperty.aidl
@@ -1946,7 +1946,8 @@
      * Represents property for Seat easy access feature.
      *
      * If true, the seat will automatically adjust to make it easier for the occupant to enter and
-     * exit the vehicle.
+     * exit the vehicle. Each area ID must map to the seat that the user is trying to enter/exit
+     * with the help of the easy access feature.
      *
      * @change_mode VehiclePropertyChangeMode.ON_CHANGE
      * @access VehiclePropertyAccess.READ_WRITE