Update driveitem-move.md

added example for root folder call to get its ID. I see on the forums many people struggling to undertand this

Author: rohit404404

api-reference/v1.0/api/driveitem-move.md

@@ -53,7 +53,7 @@ Existing properties that are not included in the request body will maintain thei
 For best performance you shouldn't include existing values that haven't changed.
 
 **Note:** When moving items to the root of a drive your app cannot use the `"id:" "root"` syntax.
-Your app needs to provide the actual ID of the root folder for the parent reference.
+Your app needs to provide the actual ID of the root folder for the parent reference.  i.e. `/drives/{drive-id}/root`
 
 ## Response