custom_attribute_exclude added to default ini

Author: muratbulat

settings-example.ini

@@ -354,8 +354,9 @@ password = super-secret
 ; host NIC with a matching MAC address will be excluded from sync.
 ;host_nic_exclude_by_mac_list = AA:BB:CC:11:22:33, 66:77:88:AA:BB:CC
 
-; defines a comma separated list of custom attribute which should be excluded from sync. Any
-;custom_attribute_exclude = VB_LAST_BACKUP
+; defines a comma separated list of custom attribute which should be excluded from sync.
+; Any custom attribute with a matching attribute key will be excluded from sync.
+;custom_attribute_exclude = VB_LAST_BACKUP, VB_LAST_BACKUP2
 
 [source/my-redfish-example]