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Strictly answering your question, you could edit this line here

However, ROS topics can be renamed without making code changes

<node pkg="teleop_twist_joy" name="teleop_twist_joy" type="teleop_node">
    <rosparam command="load" file="$(find teleop_twist_joy)/config/$(arg joy_config).config.yaml" />
    <remap from="cmd_vel" to="My_robot/cmd_vel"/>        
</node>