Add optimistic DNS cache

docs/configuration/experimental/cache-file.md

@@ -1,5 +1,10 @@
 !!! question "Since sing-box 1.8.0"
 
+!!! quote "Changes in sing-box 1.14.0"
+
+    :material-delete-clock: [store_rdrc](#store_rdrc)  
+    :material-plus: [store_dns](#store_dns)
+
 !!! quote "Changes in sing-box 1.9.0"
 
     :material-plus: [store_rdrc](#store_rdrc)  
@@ -14,7 +19,8 @@
   "cache_id": "",
   "store_fakeip": false,
   "store_rdrc": false,
-  "rdrc_timeout": ""
+  "rdrc_timeout": "",
+  "store_dns": false
 }
 ```
 
@@ -42,6 +48,10 @@ Store fakeip in the cache file
 
 #### store_rdrc
 
+!!! failure "Deprecated in sing-box 1.14.0"
+
+    `store_rdrc` is deprecated and will be removed in sing-box 1.16.0, check [Migration](/migration/#migrate-store-rdrc).
+
 Store rejected DNS response cache in the cache file
 
 The check results of [Legacy Address Filter Fields](/configuration/dns/rule/#legacy-address-filter-fields)
@@ -52,3 +62,9 @@ will be cached until expiration.
 Timeout of rejected DNS response cache.
 
 `7d` is used by default.
+
+#### store_dns
+
+!!! question "Since sing-box 1.14.0"
+
+Store DNS cache in the cache file.