minor fix

Author: bandersmsft

articles/cost-management-billing/toc.yml

@@ -228,7 +228,7 @@
       - name: Upgrade free account
         href: manage/upgrade-azure-subscription.md
       - name: Microsoft Entra ID Free
-        href: manage/microsoft-entra-ide-free.md
+        href: manage/microsoft-entra-id-free.md
   - name: Manage payment methods
     items:
     - name: Pay your Azure bill