docs(fix): add term structure file != structured file

docs/structured_data.rst

@@ -93,6 +93,8 @@ It enables us to:
 
 By default there is no namespace.
 
+.. _defaultnamespace:
+
 The default namespace
 ~~~~~~~~~~~~~~~~~~~~~
 

docs/tutorial/namespace.rst

@@ -24,6 +24,41 @@ Namespaces
        git clone https://forge.cloud.silique.fr/stove/rougail-tutorials.git
        git switch --detach 1.1_180
 
+Namespace
+------------
+
+
+
+rougail -m firefox/ -s Firefox --types types/proxy --modes_level basic standard advanced -o doc
+
+qu'est-ce que c'est que ce -s ? 
+
+rougail -m firefox/ -s Firefox --types types/proxy --modes_level basic standard advanced -u yaml -yf config/01/config.yml
+
+
+
+----------------------------------------------------------------------------------
+
+Separation of structures into namespaces
+----------------------------------------
+
+.. glossary:: 
+
+   namespace
+
+       A namespace is a way to organize and group related variables under a unique name.
+
+It enables us to:
+
+- avoid naming conflicts
+- allow logical grouping: related variables can be grouped together
+- scope control: namespaces limit the visibility of variable to the namespace itself
+
+.. note:: By default there is no named namespace set, 
+          actually there is always a namespace, :ref:`the default namespace <defaultnamespace>`.
+
+
+---------------------------------------------------------------------------------
 Namespace
 -----------