incorrect fields included in delete example

Author: asya999

source/reference/change-events.txt

@@ -259,12 +259,6 @@ The following example illustrates a ``delete`` event:
 
    {
       _id: { < Resume Token > },
-      "ns":"engineering.users",
-      "documentKey":{  
-         "_id":{  
-            "$oid":"599af247bb69cd89961c986d"
-         }
-      },
       operationType: 'delete',
       ns: {
          db: 'engineers',