feat(images) change the old pictures showing fusiondirectory 1.0.8 in the manual

Signed-off-by: Benoit Mortier <benoit.mortier@fusiondirectory.org>

source/fusiondirectory/pluginsystem/attributes.rst

@@ -109,6 +109,9 @@ CompositeAttribute
 
 Allow to handle several UI attributes which are stored as only one LDAP field.
 For instance let's say you store an FTP connection URL in an LDAP field as "ftp://user:password@host:port" but you want to display 4 inputs for the 4 parts.
+
+.. image:: /_static/images/attributes/composite.png
+
 That would look like :
 
 .. code-block:: php