try targeted breadcrumb in central bc toc

Author: PatrickFarley

breadcrumb/azure-ai/toc.yml

@@ -70,6 +70,9 @@ items:
     - name: Content Understanding
       tocHref: /azure/ai-services/content-understanding/
       topicHref: /azure/ai-services/content-understanding/
+    - name: Content Understanding
+      tocHref: /ai-foundry/responsible-ai/content-understanding/
+      topicHref: /azure/ai-services/content-understanding/
     - name: Agent Service
       tocHref: /azure/ai-services/agents/
       topicHref: /azure/ai-services/agents/