Update toc.yml

Removing Preview Label from Private Link Article, 
Feature is now GA

Author: ShaneBala-keyvault

articles/key-vault/toc.yml

@@ -129,7 +129,7 @@
     href: tutorial-rotation.md
   - name: Integrate with Azure Policy
     href: azure-policy.md
-  - name: Integrate with Azure Private Link Service (Preview)
+  - name: Integrate with Azure Private Link Service
     href: private-link-service.md
   - name: Azure Key Vault logging
     href: key-vault-logging.md
@@ -215,4 +215,4 @@
   - name: Blog
     href: https://blogs.technet.com/b/kv/
   - name: Product Feedback
-    href: https://feedback.azure.com/forums/906355-azure-key-vault
+    href: https://feedback.azure.com/forums/906355-azure-key-vault