Update toc.yml

Author: laujan

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

@@ -54,14 +54,14 @@ items:
   - name: Video
     href: video/overview.md
     displayName: video, audio, voice, recognition, synthesis, speaker, identification, verification, diarization, transcription, translation, language, understanding, sentiment, analysis, emotion, detection, pronunciation, model
-  - name: Concepts
+- name: Concepts
     items:
       - name: Best practices
         displayName: best practices, analyzers, optimization, fields
         href: concepts/best-practices.md
       - name: Accuracy and confidence
         displayName: accuracy, confidence, analyzers, optimization, fields, scores
-        href: concepts/accuracy-confidence.md
+        href: concepts/accuracy-confidence.md  
 - name: Responsible AI
   items:
     - name: Transparency note