drm/amdgpu/disply: fix documentation warnings in display manager

Add documentation for crc window.

Fixes: c920888 ("drm/amd/display: Expose new CRC window property")
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: Wayne Lin <Wayne.Lin@amd.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Wayne Lin <Wayne.Lin@amd.com>

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

@@ -337,10 +337,29 @@ struct amdgpu_display_manager {
 	const struct gpu_info_soc_bounding_box_v1_0 *soc_bounding_box;
 
 #ifdef CONFIG_DEBUG_FS
-	/* set the crc calculation window*/
+	/**
+	 * @crc_win_x_start_property:
+	 *
+	 * X start of the crc calculation window
+	 */
 	struct drm_property *crc_win_x_start_property;
+	/**
+	 * @crc_win_y_start_property:
+	 *
+	 * Y start of the crc calculation window
+	 */
 	struct drm_property *crc_win_y_start_property;
+	/**
+	 * @crc_win_x_end_property:
+	 *
+	 * X end of the crc calculation window
+	 */
 	struct drm_property *crc_win_x_end_property;
+	/**
+	 * @crc_win_y_end_property:
+	 *
+	 * Y end of the crc calculation window
+	 */
 	struct drm_property *crc_win_y_end_property;
 #endif
 	/**