Fix http://localhost/ hints in top-level INSTALL document.

Submitted by: Rob Jenson <robjen@spotch.com>
Fixed by: Ralf S. Engelschall
PR: 3088


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@82203 13f79535-47bb-0310-9956-ffa450edef68