Update link

Author: MikeRayMSFT

articles/azure-arc/data/toc.yml

@@ -151,7 +151,7 @@ items:
             - name: Rotate certificates
               href: rotate-user-tls-certificate.md
             - name: Resize persistent volume (PVC)
-              href: resize-persistent-volume-claim
+              href: resize-persistent-volume-claim.md
             - name: Delete
               href: delete-managed-instance.md
         - name: Upgrade