updating filemetadata in docfx.json

add ROBOTS field, troubleshooting ms.prod and ms.service fields.

Author: dstrome

sharepoint/docfx.json

@@ -61,10 +61,13 @@
     },
     "fileMetadata": {
       "ms.service":{
-        "sharepoint-online/*.md":"sharepoint-powershell"
+        "sharepoint-ps/sharepoint-online/*.md":"sharepoint-powershell"
       },
       "ms.prod":{
-        "sharepoint-server/*.md":"sharepoint-2016-powershell"
+        "sharepoint-ps/sharepoint-server/*.md":"sharepoint-2016-powershell"
+      },
+      "ROBOTS":{
+        "sharepoint-ps/sharepoint-pnp/*.md":"NOINDEX,NOFOLLOW"
       }
     },
     "template": [],