updates to TOC file names in TOCs

Author: skpmcdowell

articles/ai-services/toc.yml

@@ -8,7 +8,7 @@ items:
     href: what-are-ai-services.md
     displayName: applied, cognitive, form
   - name: What's new in Azure AI services?
-    href: whats-new.md
+    href: whats-new-ai-services.md    
   - name: Language support
     href: language-support.md
   - name: Pricing

articles/ai-studio/toc.yml

@@ -3,6 +3,8 @@ items:
   href: index.yml
 - name: What is Azure AI Foundry?
   href: what-is-ai-studio.md
+- name: What's new in Azure AI Foundry?
+  href: whats-new-ai-studio.md
 - name: Get started
   expanded: true
   items: