Make a little effort to update the suexec docs to the 2.0 world.

This still needs considerable attention.

Submitted by: Chris Herbst <chris@herbst.com>, Joshua Slive


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@96146 13f79535-47bb-0310-9956-ffa450edef68