fix: wrong role specified (#1108)

Author: mjang

content/nginx-one/rbac/roles.md

@@ -13,7 +13,7 @@ We provide three default **[roles](https://docs.cloud.f5.com/docs-v2/administrat
 
 ### Admin
 
-The Admin role, identified as `f5xc-nginx-one-standard-admin`, provides full read and write access to all endpoints and features within the NGINX One Console.
+The Admin role, identified as `f5xc-nginx-one-admin`, provides full read and write access to all endpoints and features within the NGINX One Console.
 It also supports Role-based access control for related XC services.<!--, as described in [Role-based Access Control Concepts](https://docs.cloud.f5.com/docs-v2/administration/how-tos/user-mgmt/rbac).-->
 
 ### User