chore(avoidance): update comment

Signed-off-by: satoshi-ota <satoshi.ota928@gmail.com>

Author: satoshi-ota

planning/behavior_path_avoidance_module/include/behavior_path_avoidance_module/data_structs.hpp

@@ -384,7 +384,8 @@ struct ObjectData  // avoidance target
   rclcpp::Time last_move;
   double stop_time{0.0};
 
-  // store the information of the lanelet which the object's overhang is currently occupying
+  // It is one of the ego driving lanelets (closest lanelet to the object) and used in the logic to
+  // check whether the object is on the ego lane.
   lanelet::ConstLanelet overhang_lanelet;
 
   // the position at the detected moment