drm/amd/display: fix spelling mistake "exeuction" -> "execution"

There are spelling mistakes in a DC_ERROR message and a comment.
Fix these.
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/dc_dmub_srv.c

@@ -92,7 +92,7 @@ void dc_dmub_srv_cmd_execute(struct dc_dmub_srv *dc_dmub_srv)
 
 	status = dmub_srv_cmd_execute(dmub);
 	if (status != DMUB_STATUS_OK)
-		DC_ERROR("Error starting DMUB exeuction: status=%d\n", status);
+		DC_ERROR("Error starting DMUB execution: status=%d\n", status);
 }
 
 void dc_dmub_srv_wait_idle(struct dc_dmub_srv *dc_dmub_srv)

drivers/gpu/drm/amd/display/dmub/inc/dmub_srv.h

@@ -416,7 +416,7 @@ enum dmub_status dmub_srv_cmd_queue(struct dmub_srv *dmub,
  * dmub_srv_cmd_execute() - Executes a queued sequence to the dmub
  * @dmub: the dmub service
  *
- * Begins exeuction of queued commands on the dmub.
+ * Begins execution of queued commands on the dmub.
  *
  * Return:
  *   DMUB_STATUS_OK - success