docs(fix): sequence

docs/tutorial/multiple.rst

@@ -24,6 +24,8 @@ Variable with multiple values
        git clone https://forge.cloud.silique.fr/stove/rougail-tutorials.git
        git switch --detach v1.1_110
 
+.. _tutorial_not_mandatory_list:
+
 A conditional disabled non mandatory variable with type domainname and parameters
 -----------------------------------------------------------------------------------
 
@@ -101,6 +103,14 @@ We then have this output:
 
 We can see the address for which proxy will be desactivated in the output.
 
+.. note::
+
+        We had said that a variable with a mandatory parameter set to false was a :ref:`nullable variable <tutorial_nullable>`.
+        This is true only for a non :term:`multi` variable.
+
+        The value of a :term:`multi` variable which is not :term:`mandatory` will allow the empty list `[]`.
+        The :term:`mandatory` properties does not means that the `null` value is acceptable (that is the `empty` properties).
+
 A variable with multiple values
 -----------------------------------
 
@@ -218,10 +228,6 @@ Now we have this output:
        
        A multi is a multiple variable, that is a variable that can have multiple values.
 
-.. note:: Note that the value of a :term:`multi` variable which has no default value set and which is not :term:`mandatory`
-   will be the empty list `[]`
-   The :term:`mandatory` properties does not means that the `null` value is acceptable (that is the `empty` properties).
-
 .. keypoints:: Key points
 
    We have now some kind of a container facility named `multi`, that can be applied 

docs/tutorial/nullable.rst

@@ -1,3 +1,5 @@
+.. _tutorial_nullable:
+
 Nullable variable
 ==========================
 

docs/tutorial/sequence.rst

@@ -69,8 +69,24 @@ Here is the structure file associated with this use case:
 Unsurprisingly, the way to assign the `sequence` type is done with the help of the `type` parameter.
 We see here that `proxies` is a family because it contains the variables `title` and `color`.
 
-The :term:`sequence` type ensures that in the `proxies` family, if a proxy type is specified, then an associated color will also be specified.
+There is nothing new to say to this two variable:
-Let's launch the Rougail CLI on this structured data:
+
+- `title` is not mandatory string
+- `color` is just a string
+
+.. note::
+
+   The first variable of the :term:`sequence` is not mandatory.
+   This does not mean that the variable is :ref:`tutorial_nullable` or that the :ref:`list is empty <tutorial_not_mandatory_list>`.
+   In this case, that means that the sequence is empty.
+
+Which we could write in JSON like this:
+
+        .. code-block:: json
+
+           []
+
+Now configure the sequence:
 
 .. extinclude:: https://forge.cloud.silique.fr/stove/rougail-tutorials/raw/commit/v1.1_190/config/02/config.yml
    :language: yaml
@@ -214,7 +230,7 @@ and which contain the same number of elements:
    Sequence.
    We saw a :term:`sequence` type family, which full name is :ref:`Sequence of homogeneous elements <sequence_family>`.
 
-   **comments**
+   **Comments**
 
    What is remarkable here is that we are dealing with a new form of :term:`consistency`
    which focuses on variables that are similar within a family,