comments update

lv_obj/lv_dispi.h

@@ -40,8 +40,8 @@ typedef struct
 
 typedef enum
 {
-    LV_ACTION_RES_INV = 0,
-	LV_ACTION_RES_OK,
+    LV_ACTION_RES_INV = 0,      /*Typically indicates that the object is deleted (become invalid) in the action function*/
+	LV_ACTION_RES_OK,           /*The object is valid (no deleted) after the action*/
 }lv_action_res_t;
 
 typedef lv_action_res_t ( * lv_action_t) (struct __LV_OBJ_T * obj, lv_dispi_t * dispi);