docs(tutorial): namespaces

add multiple namespaces foxyproxy use case

docs/tutorial/namespace.rst

@@ -134,9 +134,37 @@ New "FoxyProxy" namespace
 
           git switch --detach 1.1_181
 
-Variables related to the Foxy Proxy plugin will be stored in a separate namespaces.
-
 .. image:: images/foxyproxy.png
 
+We can see in the FoxyProxy widget that it is possible to add as many proxies as needed.
 
+So our use case enables us to handle variables related to the Foxy Proxy plugin
+that should be stored in a separate namespace.
 
+.. type-along:: Handling multiple namespaces
+
+It is perfectly possible to define multiple namespaces with Rougail.
+In the Rougail CLI, the `-s` option is reserved for the main namespace.
+If we need  to add a namespace named FoxyProxy, we must use the `-xn FoxyProxy` option.
+However, we also need to specify the parameter that indicates the location 
+of the structure files corresponding to this namespace.
+The `-xd 0 foxyproxy/` option is used to specify the relevant file or folder, 
+here, the :file:`foxyproxy` folder:
+
+.. raw:: html
+   :class: terminal
+   :url: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/commit/v1.1_181/config/01/cmd_ro.txt
+
+..
+    rougail -m firefox/ -s Firefox -xn FoxyProxy -xd 0 foxyproxy/ --types types/proxy --modes_level basic standard advanced -u yaml -yf config/01/config.yml
+
+The additional namespace is therefore specified via the two command-line options:
+
+.. code-block:: shell
+
+    -xn FoxyProxy -xd 0 foxyproxy/
+
+.. keypoints:: let's review the key points
+
+   We learned how to create a namespace for our use case, and even how to use 
+   multiple namespaces—that is, how to implement several logical separations.