Fixes javadoc

Change-Id: I6231432b1be61b4004cef139529d9ab6c8b8574b
diff --git a/apps/dhcprelay/web/src/main/java/org/onosproject/dhcprelay/rest/DhcpRelayWebResource.java b/apps/dhcprelay/web/src/main/java/org/onosproject/dhcprelay/rest/DhcpRelayWebResource.java
index 1a48ea5..3f343f2 100644
--- a/apps/dhcprelay/web/src/main/java/org/onosproject/dhcprelay/rest/DhcpRelayWebResource.java
+++ b/apps/dhcprelay/web/src/main/java/org/onosproject/dhcprelay/rest/DhcpRelayWebResource.java
@@ -43,7 +43,6 @@
 import javax.ws.rs.core.MediaType;
 import javax.ws.rs.core.Response;
 
-import java.io.IOException;
 import java.util.Collection;
 import java.util.Map;
 import java.util.List;
@@ -70,8 +69,7 @@
      * Corresponding route from the route store
      *
      * @param prefix IpPrefix
-     * @return 204 NO CONTENT
-     * @throws IOException to signify bad request
+     * @return 204 NO CONTENT, 404; 401
      */
     @DELETE
     @Path("{prefix}")