drm/doc: integrate crtc helper api into docbook

- Add the missing doc for drm_helper_move_panel_connectors_to_head.
- Fixup any outdated stuff in existing sections. I've only looked at
  those kerneldoc headers that actually resulted in a complaint from
  the kerneldoc parser tool.

v2:
- Actually include the docbook snippet in the right patch.
- Fix spelling fail.

v3: It's now called drm_crtc_helper_set_mode, spotted by Laurent
Pinchart.

Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>

Documentation/DocBook/drm.tmpl

@@ -2096,6 +2096,10 @@ void intel_crt_init(struct drm_device *dev)
         </listitem>
       </itemizedlist>
     </sect2>
+    <sect2>
+      <title>Modeset Helper Functions Reference</title>
+!Edrivers/gpu/drm/drm_crtc_helper.c
+    </sect2>
   </sect1>
 
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