Point links to the pages that used to be in 'more' to the site.

[SVN r43210]

doc/quickbook/facade_tutorial.qbk

@@ -7,7 +7,7 @@ example of a linked list of polymorphic objects.  This example was
 inspired by a 
 [@http://thread.gmane.org/gmane.comp.lib.boost.user/5100 `posting`]
 by Keith Macdonald on the 
-[@../../../more/mailing_lists.htm#users `Boost-Users`]
+[@http://www.boost.org/more/mailing_lists.htm#users `Boost-Users`]
 mailing list.