Update index.mdx

website/pages/api-docs/secret/ssh/index.mdx

@@ -136,6 +136,9 @@ This endpoint creates or updates a named role.
   credentials for all other usernames in this list. Use with caution. N.B.: if
   the type is `ca`, an empty list does not allow any user; instead you must use
   `*` to enable this behavior.
+
+- `allowed_users_template` `(bool: false)` - If set, allowed_users can be specified
+  using identity template policies. Non-templated users are also permitted.
 
 - `allowed_domains` `(string: "")` – The list of domains for which a client can
   request a host certificate. If this option is explicitly set to `"*"`, then