Wrong documentation for spawning entities over ros2 in Harmonic+Humble

[Tuxliri]

Environment

• OS Version: Ubuntu 22.05
• Source or binary build?
  Binary, Gazebo Sim, version 8.9.0

Note: Gazebo harmonic was installed through the PX4 dev environment setup script.

Description

Following the documentation for spawning models through ROS2 does not work, the ros2 launch ros_gz_sim gz_spawn_model.launch.py world:=empty file:=$(ros2 pkg prefix --share ros_gz_sim_demos)/models/vehicle/model.sdf entity_name:=my_vehicle x:=5.0 y:=5.0 z:=0.5 fails due to the file gz_spawn_model.launch.py being missing.

The only way to spawn an entity is through ros2 run ros_gz_sim_create see here.