changed observability toc entry to match agents

Author: s-polly

articles/ai-foundry/toc-files/observability/toc.yml

@@ -61,7 +61,7 @@ items:
   items:
    - name: Trace your application
      href: ../../how-to/develop/trace-application.md
-   - name: Trace your agent
+   - name: Trace and observe agents
      href: ../../how-to/develop/trace-agents-sdk.md
 - name: A/B experimentation
   href: ../../concepts/a-b-experimentation.md