rebase to new mode name

Signed-off-by: Yuki Takagi <yuki.takagi@tier4.jp>

Author: yuki-takagi-66

autoware_launch/launch/planning_simulator.launch.xml

@@ -41,7 +41,7 @@
   <arg
     name="localization_sim_mode"
     default="api"
-    description="Select localization mode. Options are 'none' or 'api'. 'api' starts an external API for initial position estimation. 'none' does not start any localization-related process."
+    description="Select localization mode. Options are 'none', 'api' or 'pose_twist_estimator'. 'api' starts an external API for initial position estimation. 'none' does not start any localization-related process."
   />
 
   <group scoped="false">