drm/amd/display/dc/link/link_detection: Demote a couple of kerneldoc abuses

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../display/dc/link/link_detection.c:877: warning: Function parameter or member 'link' not described in 'detect_link_and_local_sink'
 drivers/gpu/drm/amd/amdgpu/../display/dc/link/link_detection.c:877: warning: Function parameter or member 'reason' not described in 'detect_link_and_local_sink'
 drivers/gpu/drm/amd/amdgpu/../display/dc/link/link_detection.c:1232: warning: Function parameter or member 'link' not described in 'dc_link_detect_connection_type'

Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Leo Li <sunpeng.li@amd.com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
Cc: David Airlie <airlied@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Lee Jones <lee@kernel.org>
Cc: Wenjing Liu <wenjing.liu@amd.com>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/link/link_detection.c

@@ -832,7 +832,7 @@ static void verify_link_capability(struct dc_link *link, struct dc_sink *sink,
 		verify_link_capability_non_destructive(link);
 }
 
-/**
+/*
  * detect_link_and_local_sink() - Detect if a sink is attached to a given link
  *
  * link->local_sink is created or destroyed as needed.
@@ -1185,7 +1185,7 @@ static bool detect_link_and_local_sink(struct dc_link *link,
 	return true;
 }
 
-/**
+/*
  * link_detect_connection_type() - Determine if there is a sink connected
  *
  * @type: Returned connection type