documentation: Fix typo

Co-authored-by: chenqixin <[email protected]>

docs/configuration/experimental/clash-api.md

@@ -63,7 +63,7 @@ icon: material/new-box
     {
       "external_controller": "0.0.0.0:9090",
       "external_ui": "dashboard"
-      // external_ui_download_detour: "direct"
+      // "external_ui_download_detour": "direct"
     }
     ```
 

docs/configuration/experimental/clash-api.zh.md

@@ -63,7 +63,7 @@ icon: material/new-box
     {
       "external_controller": "0.0.0.0:9090",
       "external_ui": "dashboard"
-      // external_ui_download_detour: "direct"
+      // "external_ui_download_detour": "direct"
     }
     ```