Add cli commands to verify if plugin has been successfully registered

plugin_tutorials/docs/writing_new_behavior_plugin.rst

@@ -192,8 +192,20 @@ It is good practice to place these lines at the end of the file but technically,
     <nav2_core plugin="${prefix}/behavior_plugin.xml" />
   </export>
 
-5. Compile and it should be registered. Next, we'll use this plugin.
+5. Compile and it should be registered. You can verify that it has been successfully registered by running:
 
+.. code-block:: shell
+
+  $ ros2 plugin list
+
+You should see an output similar to below:
+
+.. code-block:: shell
+
+  nav2_sms_behavior:
+        Plugin(name='nav2_sms_behavior::SendSms', type='nav2_sms_behavior::SendSms', base='nav2_core::Behavior')
+
+Next, we'll use this plugin.
 
 3- Pass the plugin name through params file
 -------------------------------------------

plugin_tutorials/docs/writing_new_costmap2d_plugin.rst

@@ -174,7 +174,18 @@ Plugin description file is also should be added to ``package.xml``. ``costmap_2d
 
 After everything is done put the plugin package into ``src`` directory of a certain ROS 2-workspace, build the plugin package (``colcon build --packages-select nav2_gradient_costmap_plugin --symlink-install``) and source ``setup.bash`` file when it necessary.
 
-Now the plugin is ready to use.
+Now the plugin is ready to use. You can verify that it has been successfully registered by running:
+
+.. code-block:: shell
+
+  $ ros2 plugin list
+
+You should see an output similar to below:
+
+.. code-block:: shell
+
+  nav2_gradient_costmap_plugin:
+        Plugin(name='nav2_gradient_costmap_plugin::GradientLayer', type='nav2_gradient_costmap_plugin::GradientLayer', base='nav2_costmap_2d::Layer')
 
 3- Enable the plugin in Costmap2D
 ---------------------------------

plugin_tutorials/docs/writing_new_nav2controller_plugin.rst

@@ -251,7 +251,20 @@ It is good practice to place these lines at the end of the file, but technically
     <nav2_core plugin="${prefix}/pure_pursuit_controller_plugin.xml" />
   </export>
 
-5. Compile, and it should be registered. Next, we'll use this plugin.
+5. Compile, and it should be registered. You can verify that it has been successfully registered by running:
+
+.. code-block:: shell
+
+  $ ros2 plugin list
+
+You should see an output similar to below:
+
+.. code-block:: shell
+
+  nav2_pure_pursuit_controller:
+        Plugin(name='nav2_pure_pursuit_controller::PurePursuitController', type='nav2_pure_pursuit_controller::PurePursuitController', base='nav2_core::Controller')
+
+Next, we'll use this plugin.
 
 3- Pass the plugin name through the params file
 -----------------------------------------------

plugin_tutorials/docs/writing_new_nav2planner_plugin.rst

@@ -183,7 +183,20 @@ It is good practice to place these lines at the end of the file, but technically
     <nav2_core plugin="${prefix}/global_planner_plugin.xml" />
   </export>
 
-5. Compile and it should be registered. Next, we'll use this plugin.
+5. Compile and it should be registered. You can verify that it has been successfully registered by running:
+
+.. code-block:: shell
+
+  $ ros2 plugin list
+
+You should see an output similar to below:
+
+.. code-block:: shell
+
+  nav2_straightline_planner:
+        Plugin(name='nav2_straightline_planner::StraightLine', type='nav2_straightline_planner::StraightLine', base='nav2_core::GlobalPlanner')
+
+Next, we'll use this plugin.
 
 3- Pass the plugin name through params file
 -------------------------------------------

plugin_tutorials/docs/writing_new_navigator_plugin.rst

@@ -310,7 +310,20 @@ It is good practice to place these lines at the end of the file, but technically
     <nav2_core plugin="${prefix}/navigator_plugin.xml" />
   </export>
 
-5. Compile, and it should be registered. Next, we'll use this plugin.
+5. Compile, and it should be registered. You can verify that it has been successfully registered by running:
+
+.. code-block:: shell
+
+  $ ros2 plugin list
+
+You should see an output similar to below:
+
+.. code-block:: shell
+
+  nav2_bt_navigator:
+        Plugin(name='nav2_bt_navigator::NavigateToPoseNavigator', type='nav2_bt_navigator::NavigateToPoseNavigator', base='nav2_core::NavigatorBase')
+
+Next, we'll use this plugin.
 
 3- Pass the plugin name through the params file
 -----------------------------------------------