toc update

Author: amsliu

articles/active-directory/governance/TOC.yml

@@ -200,7 +200,7 @@
         href: ../privileged-identity-management/pim-perform-azure-ad-roles-and-resource-roles-review.md?toc=%2fazure%2factive-directory%2fgovernance%2ftoc.json
       - name: Complete an access review
         href: ../privileged-identity-management/pim-complete-azure-ad-roles-and-resource-roles-review.md?toc=%2fazure%2factive-directory%2fgovernance%2ftoc.json
-    - name: Azure AD Privileged Access Groups
+    - name: Azure AD Privileged Access Groups (Preview)
       items:
       - name: Create an access review
         href: create-access-review-pag.md