Move vhost example to extra/. Also improve the comment

and the "default" vhost issue, and add a second <VirtualHost>
section since it doesn't make sense to add just one.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/simple-conf@159794 13f79535-47bb-0310-9956-ffa450edef68