Update osi_detectedobject.proto, ground_clearance is included in base().height.

Author: PhRosenberger

osi_detectedobject.proto

@@ -159,6 +159,7 @@ message DetectedMovingObject
     //
     // \note The bounding box does NOT includes mirrors for vehicles.
     // \note The parent frame of \c base is the sensor's vehicle frame.
+    // \note The height includes the ground_clearance, so always goes from top to ground.
     //
     optional BaseMoving base = 2;