Add documentation for new fields

Signed-off-by: Ulysse Gérard <[email protected]>

doc/dune-files.rst

@@ -1858,7 +1858,7 @@ Note that this feature is still experimental and needs to be enabled in your
 
 .. code:: scheme
 
-  (using mdx 0.1)
+  (using mdx 0.2) ; Version 0.2 of the stanza requires mdx >= 1.9.0
 
 The syntax is as follows:
 
@@ -1872,23 +1872,30 @@ Where ``<optional-fields>`` are:
   list of globs (see the :ref:`Glob language specification <glob>` ).
   It defaults to ``*.md``.
 
-- ``(packages <packages>)`` are the local dune packages that your documentation
-  code blocks depend on. I.e. if your documentation examples depend on a public
-  executable or library defined from a local package, it has to be specified in
-  the stanza.
+- ``(deps <deps-conf list>)`` (since version 0.2) to specify the dependencies
+  of your documentation code blocks. See the :ref:`deps-field` section for more
+  details.
+
+- ``(packages <packages>)`` (deprecated in version 0.2) are the local dune 
+  packages that your documentation code blocks depend on. I.e. if your
+  documentation examples depend on a public executable or library defined from
+  a local package, it has to be specified in the stanza.
 
 - ``(preludes <files>)`` are the prelude files you want to pass to MDX.
   See `MDX's documentation <https://github.com/realworldocaml/mdx>`__ for more
   details on preludes.
 
+- ``(libraries <files>)`` (since version 0.2) are libraries that should be
+  statically linked in the MDX test executable.
+
 - ``(enabled_if <blang expression>)`` is the same as the corresponding field of
   `library`_.
 
-- ``(package <package>)`` specifies which package to attach this stanza to
-  (similarly to when ``(package)`` is attached to a ``(rule)`` stanza. When
-  ``-p`` is passed, ``(mdx)`` stanzas with an other package will be ignored.
-  Note that this is feature is completely separate from ``(packages)``, which
-  specifies some dependencies.
+- ``(package <package>)`` (since Dune 2.9) specifies which package to attach
+  this stanza to (similarly to when ``(package)`` is attached to a ``(rule)``
+  stanza. When  ``-p`` is passed, ``(mdx)`` stanzas with an other package will
+  be ignored. Note that this is feature is completely separate from 
+  ``(packages)``, which specifies some dependencies.
 
 .. _plugin: