Update toc.yml

Author: v-edmckillop

articles/active-directory/fundamentals/toc.yml

@@ -88,7 +88,7 @@ items:
     - name: What's new in Azure Active Directory
       href: whats-new.md
     - name: What's deprecated in Azure Active Directory?
-      href: whats-deprecated-azure-ad
+      href: whats-deprecated-azure-ad.md
     - name: What's new in sovereign clouds?
       href: whats-new-sovereign-clouds.md  
     - name: Archive for What's new? in Azure AD