remove proxy sample config

Suggested by: Joshua Slive
Acked by: Cliff Woolley, Sander Striker, David Reid, /me


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@100464 13f79535-47bb-0310-9956-ffa450edef68