Modified comment to mark as deprecated in a uniform way - enum actor

Signed-off-by: Marcel Sachse <msachse@pmsfit.de>

Author: MarcelOliver

osi_trafficsign.proto

@@ -9013,8 +9013,10 @@ message TrafficSign
             // Definition of the traffic actors the supplementary sign makes
             // reference to. E.g. bikes, trucks, cars, etc.
             //
-            // May be deprecated or changed in the future.
-            // Discussions will continue in Harmonization OpenX group.
+            // \attention Deprecated: OpenDRIVE categorization for traffic signs is more generic than OSI enum
+            // (see <a href="https://releases.asam.net/OpenDRIVE/1.6.0/ASAM_OpenDRIVE_BS_V1-6-0.html#_signals">OpenDRIVE V1-6-0</a>).<br>
+            // How the enum Actor will be dealt in future will be discussed in Harmonization OpenX group.<br>
+            // Deprecated planned for version 4.0.0
             enum Actor
             {
                 // An unknown actor