docs: Add dri-devel to the mailing lists and drop the DRI wiki link.

The DRI wiki is a wasteland at this point, let's just fold the one bit of
useful information in here.

Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5507>

docs/lists.rst

@@ -1,7 +1,7 @@
 Mailing Lists
 =============
 
-There are four Mesa 3D / DRI mailing lists:
+These are the primary Mesa 3D / DRI mailing lists:
 
 -  `mesa-users <https://lists.freedesktop.org/mailman/listinfo/mesa-users>`__
    - intended for end-users of Mesa and DRI drivers. Newbie questions
@@ -20,6 +20,10 @@ There are four Mesa 3D / DRI mailing lists:
    - announcements of new Mesa versions are sent to this list. Very low
    traffic.
 
+-  `dri-devel <http://lists.freedesktop.org/mailman/listinfo/dri-devel>`__
+   - for the Linux/BSD Direct Rendering Module (drm) kernel modules
+   supporting Mesa's userspace drivers
+
 -  `piglit <https://lists.freedesktop.org/mailman/listinfo/piglit>`__ -
    for Piglit (OpenGL driver testing framework) discussion.
 
@@ -39,10 +43,6 @@ archives are still available, however:
 `mesa3d-users <https://sourceforge.net/mailarchive/forum.php?forum_name=mesa3d-users>`__,
 `mesa3d-dev <https://sourceforge.net/mailarchive/forum.php?forum_name=mesa3d-dev>`__.
 
-For mailing lists about Direct Rendering Modules (drm) in Linux/BSD
-kernels, see the `DRI
-wiki <https://dri.freedesktop.org/wiki/MailingLists>`__.
-
 IRC
 ---