Update ExcessiveNXDOMAINDNSQueries.yaml (#1021)

* Update ExcessiveNXDOMAINDNSQueries.yaml

fix query

* Update ExcessiveNXDOMAINDNSQueries.yaml

Detections/InfobloxNIOS/ExcessiveNXDOMAINDNSQueries.yaml

@@ -33,4 +33,4 @@ query: |
       | where isnotempty(ResponseCode)
       | where ResponseCode =~ "NXDOMAIN"
       ) on Client_IP
-  | extend timestamp = TimeGenerated, extend IPCustomEntity = Client_IP
+  | extend timestamp = TimeGenerated, IPCustomEntity = Client_IP