fix: imporve 'cmd_vel_out' argument explanation

Co-authored-by: Jan Hernas <40989249+jasiex01@users.noreply.github.com>

Author: fszkudlarek

docs/integrations/software/gazebo-simulation.mdx

@@ -164,7 +164,8 @@ ros2 launch leo_teleop joy_teleop.launch.xml cmd_vel_out:=/leo_sim1/cmd_vel
 
 You can choose which rover to operate with the joystick by providing correct
 namespace for the argument `cmd_vel_out`. In the example it's `leo_sim1`. If no
-value provided, the node will use the default namespace and topic - `/cmd_vel`.
+namespace for the argument `cmd_vel_out`. In the example it's `leo_sim1`. If the
+`cmd_vel_out` argument is not provided, the node will use the default namespace and topic - `/cmd_vel`.
 
 :::