Reference images in comments

Signed-off-by: Caspar de Haes <caspar.dehaes@five.ai>

Author: caspar-ai

osi_object.proto

@@ -783,14 +783,20 @@ message MovingObject
 
             // Vehicle is a delivery van.
             //
+            // \image html OSI_TYPE_DELIVERY_VAN.svg
+            //
             TYPE_DELIVERY_VAN = 6;
 
             // Vehicle is a (heavy) truck.
             //
+            // \image html OSI_TYPE_HEAVY_TRUCK.svg
+            //
             TYPE_HEAVY_TRUCK = 7;
 
             // Vehicle is a tractor capable of pulling a semi-trailer.
             //
+            // \image html OSI_TYPE_SEMITRACTOR.svg
+            //
             TYPE_SEMITRACTOR = 16;
 
             // This vehicle is a semi-trailer that can be pulled by a
@@ -799,13 +805,17 @@ message MovingObject
             // \note The vehicle can be, but doesn't need to be,
             // attached to another vehicle.
             //
+            // \image html OSI_TYPE_SEMITRAILER.svg
+            //
             TYPE_SEMITRAILER = 8;
 
             // Vehicle is a trailer.
             //
             // \note The vehicle can be, but doesn't need to be,
             // attached to another vehicle.
             //
+            // \image html OSI_TYPE_TRAILER.svg
+            //
             TYPE_TRAILER = 9;
 
             // Vehicle is a motorbike or moped.