Update source/Tutorials/Advanced/Simulators/MVSim/Installation-Ubuntu.rst

Co-authored-by: Alejandro Hernández Cordero <ahcorde@gmail.com>
Signed-off-by: Jose Luis Blanco-Claraco <joseluisblancoc@gmail.com>

Author: jlblancoc

source/Tutorials/Advanced/Simulators/MVSim/Installation-Ubuntu.rst

@@ -106,7 +106,7 @@ You should see the installed version number printed to the terminal.
    - ``mvsim_node``: a ROS 2 node wrapper for running the simulator and connect it to other ROS 2 nodes
 
 3 Launch a demo
-^^^^^^^^^^^^^^^^
+^^^^^^^^^^^^^^^
 
 To quickly verify everything is working, launch the warehouse demo with ROS 2: