drm: Fix hdmi connector content type property docs

Apparently didn't get carefully checked.

Fixes: 50525c33 ("drm: content-type property for HDMI connector")
Cc: Hans Verkuil <hans.verkuil@cisco.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180702091023.695-1-daniel.vetter@ffwll.ch

Documentation/gpu/drm-kms.rst

@@ -527,7 +527,7 @@ Standard Connector Properties
    :doc: standard connector properties
 
 HDMI Specific Connector Properties
------------------------------
+----------------------------------
 
 .. kernel-doc:: drivers/gpu/drm/drm_connector.c
    :doc: HDMI connector properties

drivers/gpu/drm/drm_connector.c

@@ -1033,9 +1033,7 @@ EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);
  *
  *	Drivers can set up this property by calling
  *	drm_connector_attach_content_type_property(). Decoding to
- *	infoframe values is done through
- *	drm_hdmi_get_content_type_from_property() and
- *	drm_hdmi_get_itc_bit_from_property().
+ *	infoframe values is done through drm_hdmi_avi_infoframe_content_type().
  */
 
 /**