add to toc

Author: PatrickFarley

articles/ai-services/content-safety/toc.yml

@@ -43,6 +43,8 @@ items:
     href: studio-quickstart.md
   - name: Text moderation
     href: quickstart-text.md
+  - name: Blocklists
+    href: quickstart-blocklist.md
   - name: Image moderation
     href: quickstart-image.md
   - name: Multimodal moderation (preview)