Add rejected DNS response cache support

docs/configuration/dns/rule.md

@@ -339,10 +339,14 @@ Will overrides `dns.client_subnet` and `servers.[].client_subnet`.
 
 Only takes effect for IP address requests. When the query results do not match the address filtering rule items, the current rule will be skipped.
 
-!!! note ""
+!!! info ""
 
     `ip_cidr` items in included rule sets also takes effect as an address filtering field.
 
+!!! note ""
+
+    Enable `experimental.cache_file.store_rdrc` to cache results.
+
 #### geoip
 
 !!! question "Since sing-box 1.9.0"

docs/configuration/dns/rule.zh.md

@@ -337,10 +337,14 @@ DNS 查询类型。值可以为整数或者类型名称字符串。
 
 仅对IP地址请求生效。 当查询结果与地址筛选规则项不匹配时，将跳过当前规则。
 
-!!! note ""
+!!! info ""
 
     引用的规则集中的 `ip_cidr` 项也作为地址筛选字段生效。
 
+!!! note ""
+
+    启用 `experimental.cache_file.store_rdrc` 以缓存结果。
+
 #### geoip
 
 !!! question "自 sing-box 1.9.0 起"