docs: removed deprecated api #8210

docs/sources/http_api/dashboard.md

@@ -221,10 +221,6 @@ Get all tags of dashboards
       }
       }
     ]
     ]
 
 
-## Dashboard from JSON file
-
-`GET /file/:file`
-
 ## Search Dashboards
 ## Search Dashboards
 
 
 `GET /api/search/`
 `GET /api/search/`