drm/amd/display: fix documentation for amdgpu_dm_update_freesync_caps()

Document missing parameter.

Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Fixes: 8889a13f99e5 ("drm/amd/display: Add some extra kernel doc to amdgpu_dm")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -9936,7 +9936,8 @@ static int parse_hdmi_amd_vsdb(struct amdgpu_dm_connector *aconnector,
 /**
  * amdgpu_dm_update_freesync_caps - Update Freesync capabilities
  *
- * @aconnector: Connector to query.
+ * @connector: Connector to query.
+ * @edid: EDID from monitor
  *
  * Amdgpu supports Freesync in DP and HDMI displays, and it is required to keep
  * track of some of the display information in the internal data struct used by