Update documentation

docs/configuration/rule-set/index.md

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+---
+icon: material/new-box
+---
+
+# Rule Set
+
+!!! question "Since sing-box 1.8.0"
+
+### Structure
+
+```json
+{
+  "type": "",
+  "tag": "",
+  "format": "",
+  
+  ... // Typed Fields
+}
+```
+
+#### Local Structure
+
+```json
+{
+  "type": "local",
+  
+  ...
+  
+  "path": ""
+}
+```
+
+#### Remote Structure
+
+!!! info ""
+
+    Remote rule-set will be cached if `experimental.cache_file.enabled`.
+
+```json
+{
+  "type": "remote",
+  
+  ...,
+  
+  "url": "",
+  "download_detour": "",
+  "update_interval": ""
+}
+```
+
+### Fields
+
+#### type
+
+==Required==
+
+Type of Rule Set, `local` or `remote`.
+
+#### tag
+
+==Required==
+
+Tag of Rule Set.
+
+#### format
+
+==Required==
+
+Format of Rule Set, `source` or `binary`.
+
+### Local Fields
+
+#### path
+
+==Required==
+
+File path of Rule Set.
+
+### Remote Fields
+
+#### url
+
+==Required==
+
+Download URL of Rule Set.
+
+#### download_detour
+
+Tag of the outbound to download rule-set.
+
+Default outbound will be used if empty.
+
+#### update_interval
+
+Update interval of Rule Set.
+
+`1d` will be used if empty.