Update dashboard_permissions.md

miss { in repsponse

docs/sources/http_api/dashboard_permissions.md

@@ -106,6 +106,7 @@ Accept: application/json
 Content-Type: application/json
 Authorization: Bearer eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk
 
+{
   "items": [
     {
       "role": "Viewer",