added toc and index entries

Author: bandersmsft

articles/cost-management-billing/reservations/index.yml

@@ -63,6 +63,8 @@ landingContent:
         url: manage-reserved-vm-instance.md
       - text: Exchange and refund reservations
         url: exchange-and-refund-azure-reservations.md
+      - text: Changes to the reservation exchange policy
+        url: reservation-exchange-policy-changes.md
 
   # Card (optional)
   - title: Report costs after purchase

articles/cost-management-billing/reservations/toc.yml

@@ -150,6 +150,8 @@
     items:
     - name: Exchange and refund reservations
       href: exchange-and-refund-azure-reservations.md
+    - name: Changes to the reservation exchange policy
+      href: reservation-exchange-policy-changes.md
   - name: Renew reservations
     items:
     - name: Renew a reservation