Merge pull request #40 from rany2/patch-1

Clarify that defaulturl is not added to subscriptions URLs

docs/user-guide/configuration.md

@@ -200,8 +200,8 @@ reseed.proxy                           | Url for https/socks reseed proxy
 
 Option                                 | Description
 -------------------------------------- | --------------------------------------
-addressbook.defaulturl                 | AddressBook subscription URL for initial setup
-addressbook.subscriptions              | AddressBook subscriptions URLs, separated by comma
+addressbook.defaulturl                 | AddressBook subscription URL. Only used to initialize the AddressBook.
+addressbook.subscriptions              | AddressBook subscriptions URLs, separated by comma. Note that defaulturl is not added to subscriptions URLs 
 addressbook.hostsfile                  | File to dump AddressesBook in hosts.txt format
 
 ### Limits