style(comment): remove the word signal from the comments

src/extra/widgets/led/lv_led.c

@@ -164,7 +164,7 @@ static void lv_led_event(lv_obj_t * obj, lv_event_t e)
 {
     lv_res_t res;
 
-    /* Include the ancient signal function */
+    /* Call the ancestor's event handler */
     res = lv_obj_event_base(MY_CLASS, obj, e);
     if(res != LV_RES_OK) return;