Remove currently only available in Rolling from Spawn a Gazebo model … (#569)

* Remove currently only available in Rolling from Spawn a Gazebo model from ROS 2

Signed-off-by: Aarav Gupta <[email protected]>

* Make the change in Ionic also

Signed-off-by: Aarav Gupta <[email protected]>

---------

Signed-off-by: Aarav Gupta <[email protected]>

Author: Amronos

harmonic/ros2_spawn_model.md

@@ -5,7 +5,6 @@ Additionally, it's possible to spawn new models at any time. To do so using ROS
 we have provided the following mechanisms:
 
 ## Spawn a model using the launch file included in `ros_gz_sim`.
-*Currently only available in Rolling.*
 
 The package `ros_gz_sim` contains a launch file named
 `gz_spawn_model.launch.py`. You can use it to spawn a new model into an

ionic/ros2_spawn_model.md

@@ -5,7 +5,6 @@ Additionally, it's possible to spawn new models at any time. To do so using ROS
 we have provided the following mechanisms:
 
 ## Spawn a model using the launch file included in `ros_gz_sim`.
-*Currently only available in Rolling.*
 
 The package `ros_gz_sim` contains a launch file named
 `gz_spawn_model.launch.py`. You can use it to spawn a new model into an