drm/fb-cma-helper: Hook up to DocBook and fix some docs

Hook up fb_cma_helper to DocBook. Remove mention of
CONFIG_FB_DEFERRED_IO in the docs, which was forgotten in the latest
version of the deferred_io patch.
Use & when referencing drm_mode_config_funcs in docs.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1462982962-10530-3-git-send-email-noralf@tronnes.org
diff --git a/Documentation/DocBook/gpu.tmpl b/Documentation/DocBook/gpu.tmpl
index 9dd48f7..4a0c599 100644
--- a/Documentation/DocBook/gpu.tmpl
+++ b/Documentation/DocBook/gpu.tmpl
@@ -1617,6 +1617,11 @@
 !Iinclude/drm/drm_fb_helper.h
     </sect2>
     <sect2>
+      <title>Framebuffer CMA Helper Functions Reference</title>
+!Pdrivers/gpu/drm/drm_fb_cma_helper.c framebuffer cma helper functions
+!Edrivers/gpu/drm/drm_fb_cma_helper.c
+    </sect2>
+    <sect2>
       <title>Display Port Helper Functions Reference</title>
 !Pdrivers/gpu/drm/drm_dp_helper.c dp helpers
 !Iinclude/drm/drm_dp_helper.h