address review comments.

Signed-off-by: Tomoya Fujita <Tomoya.Fujita@sony.com>

Author: fujitatomoya

source/Tutorials/Advanced/Simulators/Gazebo/Gazebo.rst

@@ -24,7 +24,7 @@ First of all you should install ROS 2 and Gazebo.
 You have two options:
 
  - Install from deb packages.
- - To check which versions are available from deb packages please check this `table <https://github.com/gazebosim/ros_ign>`__.
+   To check which versions are available from deb packages please check this `table <https://github.com/gazebosim/ros_ign>`__.
  - Compile from sources:
 
    - :doc:`ROS 2 install instructions <../../../../Installation>`

source/Tutorials/Advanced/Simulators/Gazebo/Simulation-Gazebo.rst

@@ -11,3 +11,4 @@ This set of tutorials will teach you how to configure the Gazebo simulator with
    :maxdepth: 1
 
    Gazebo
+   ../../../Intermediate/URDF/Using-a-URDF-in-Gazebo

source/Tutorials/Intermediate/URDF/Using-a-URDF-in-Gazebo.rst

@@ -174,7 +174,7 @@ This will run the controller and in fact publish on the ``/joint_states`` topic,
     velocity: []
     effort: []
 
-What else do you want Gazebo?
+What else do you want Gazebo‽
 Well, it wants to know more information about the joints.
 
 ROS 2 Control Joint Definitions