Update refund.md

@@ -42,7 +42,7 @@
                 "product_skn": 51153138,
                 "product_skn": 51153138,
                 "product_sku": 894428,
                 "product_sku": 894428,
                 "size_name": "M",
                 "size_name": "M",
-                "is_limit_skn": 0, //0表示没有限制,1表示是特殊商品有限制
+                "is_limit_skn": 1, //1表示没有限制,0表示是特殊商品有限制
             }
             }
         ],
         ],
         "return_amount_info": "",
         "return_amount_info": "",