update toc

Author: MikeRayMSFT

docs/toc.yml

@@ -10357,7 +10357,7 @@ items:
     href: /azure/sql-data-warehouse/sql-data-warehouse-overview-what-is  # Would 'index.md' be better?
   - name: SQL Server on an Azure VM >
     href: /azure/virtual-machines/windows/sql/virtual-machines-windows-sql-server-iaas-overview
-- name: SQL Server on Azure Arc-enabled servers (preview)
+- name: SQL Server on Azure Arc-enabled servers
   items:
     - name: Overview
       href: sql-server/azure-arc/overview.md