fix broken links

Author: PhilKang0704

subscriptions/toc.yml

@@ -207,6 +207,6 @@
   - name: Visual Studio Administration and Subscriptions Support
     href: https://visualstudio.microsoft.com/support/support-overview-vs
   - name: Volume licensing terms
-    href: https://www.microsoft.com/licensing/product-licensing/products.aspx
+    href: https://www.microsoft.com/licensing/docs/view/Product-Terms
   - name: Microsoft Products and Services Agreement (MPSA)
     href: https://www.microsoft.com/licensing/mpsa/default.aspx