Revert "Add "toc_preview" and set to true"

Author: garycentric

sharepoint/docfx.json

@@ -49,7 +49,6 @@
       "ms.devlang": "powershell",
       "ms.date": "09/08/2021",
       "ms.topic": "reference",
-      "toc_preview": true,
       "contributors_to_exclude": [
         "rjagiewich",
         "traya1",