fix dhcp relay configuration doc

Change-Id: Ia99cbc2c5f446fe05ad3fb141b8c4bca7a34ba2d
diff --git a/configuration/dhcp-relay.rst b/configuration/dhcp-relay.rst
index 506dbe4..efebaa9 100644
--- a/configuration/dhcp-relay.rst
+++ b/configuration/dhcp-relay.rst
@@ -54,10 +54,12 @@
     {
       "apps" : {
         "org.onosproject.dhcp-relay" : {
-          "default" : {
-            "dhcpServerConnectPoint": "of:0000000000000205/24",
-            "serverIps": ["10.0.2.253", "2001:db8:2::2"]
-          }
+          "default" : [
+            {
+              "dhcpServerConnectPoint": "of:0000000000000205/24",
+              "serverIps": ["10.0.2.253", "2001:db8:2::2"]
+            }
+          ]
         }
       }
     }
@@ -95,11 +97,13 @@
     {
       "apps" : {
         "org.onosproject.dhcp-relay" : {
-          "default" : {
-            "dhcpServerConnectPoint": "of:0000000000000205/1",
-            "serverIps": ["10.0.2.253", "2001:db8:2::2"],
-            "gatewayIps": ["192.168.101.1", "1000::100:1"]
-          }
+          "default" : [
+            {
+              "dhcpServerConnectPoint": "of:0000000000000205/1",
+              "serverIps": ["10.0.2.253", "2001:db8:2::2"],
+              "gatewayIps": ["192.168.101.1", "1000::100:1"]
+            }
+          ]
         }
       }
     }