documentation: Update set_system_proxy usage

docs/configuration/inbound/http.md

@@ -40,4 +40,8 @@ No authentication required if empty.
 
     Only supported on Linux, Android, Windows, and macOS.
 
+!!! warning ""
+
+    To work on Android and iOS without privileges, use tun.platform.http_proxy instead.
+
 Automatically set system proxy configuration when start and clean up when stop.

docs/configuration/inbound/http.zh.md

@@ -40,4 +40,8 @@ HTTP 用户
 
     仅支持 Linux、Android、Windows 和 macOS。
 
+!!! warning ""
+
+    要在无特权的 Android 和 iOS 上工作，请改用 tun.platform.http_proxy。
+
 启动时自动设置系统代理，停止时自动清理。

docs/configuration/inbound/mixed.md

@@ -37,4 +37,8 @@ No authentication required if empty.
 
     Only supported on Linux, Android, Windows, and macOS.
 
-Automatically set system proxy configuration when start and clean up when stop.
+!!! warning ""
+
+    To work on Android and iOS without privileges, use tun.platform.http_proxy instead.
+
+Automatically set system proxy configuration when start and clean up when stop.

docs/configuration/inbound/mixed.zh.md

@@ -37,4 +37,8 @@ SOCKS 和 HTTP 用户
 
     仅支持 Linux、Android、Windows 和 macOS。
 
+!!! warning ""
+
+    要在无特权的 Android 和 iOS 上工作，请改用 tun.platform.http_proxy。
+
 启动时自动设置系统代理，停止时自动清理。