fix toc

Author: v-luckywang

articles/data-factory/TOC.yml

@@ -555,8 +555,9 @@ items:
       href: connector-rest.md
       displayName: timeout
     - name: Salesforce
-      href: connector-salesforce.md
       items:
+      - name: Salesforce
+        href: connector-salesforce.md
       - name: Salesforce (legacy)
         href: connector-salesforce-legacy.md
     - name: Salesforce Service Cloud