fix formatting

Author: sdgilley

articles/machine-learning/index.yml

@@ -55,7 +55,7 @@ landingContent:
   - title: "Build AI solutions"
     linkLists:
       - linkListType: quickstart
-      - links:
+        links:
           - text: "What is Azure Machine Learning prompt flow?"       
             url: prompt-flow/overview-what-is-prompt-flow.md
           - text: "Get started in prompt flow"