add article back in TOC

Author: VanMSFT

azure-sql/toc.yml

@@ -1388,6 +1388,8 @@
         href: database/always-encrypted-landing.yml
       - name: Auditing
         href: managed-instance/auditing-configure.md
+      - name: Native Windows principals
+        href: managed-instance/native-windows-principals.md
       - name: Secure public endpoints
         href: managed-instance/public-endpoint-overview.md
       - name: Server trust groups