fixup: clarify special case for core endpoint links

src/adaptors/amqp/amqp_adaptor.c

@@ -770,7 +770,10 @@ static bool AMQP_rx_handler(qd_router_t *router, qd_link_t *link)
         break;
     }
 
-    // Handle deliveries destined to a core endpoint.
+    // Handle deliveries destined to a core endpoint. Core endpoints use dedicated links that terminate in the core -
+    // meaning that deliveries arriving on these links are always consumed by the router and are not forwarded. Since
+    // these message are not routed we can skip all the following routing-related checks and simply hand the delivery
+    // directly to the core thread here.
     //
     if (qdr_link_is_core_endpoint(rlink)) {
         log_link_message(conn, pn_link, msg);