Deletes an alerter.
DELETE <webiURL>/documents/{documentId}/alerters/{alerterId}
Where:
Response type: application/xml or application/json
The response is a message stating the success or failure of the request.
DELETE <webiURL>/documents/5022/alerters/3
<success> <message>The resource of type 'Alerter' with identifier '3' has been successfully removed.</message> <id>3</id> </success>