Update TOC for TiDB Cloud to include new section on managing database users and roles

Author: shhdgit

TOC-tidb-cloud.md

@@ -770,3 +770,7 @@
   - [[2023-11-14] TiDB Cloud Dedicated Scale Feature Maintenance Notification](/tidb-cloud/notification-2023-11-14-scale-feature-maintenance.md)
   - [[2023-09-26] TiDB Cloud Console Maintenance Notification](/tidb-cloud/notification-2023-09-26-console-maintenance.md)
   - [[2023-08-31] TiDB Cloud Console Maintenance Notification](/tidb-cloud/notification-2023-08-31-console-maintenance.md)
+
+## _BUILD_ALLOWLIST
+
+- [Manage Database Users and Roles](/tidb-cloud/configure-sql-users.md)