show a little (so called) example for --with-mpm.

Submitted by:	Luiz Rocha <lsdr@lsdr.net>


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/APACHE_2_0_BRANCH@98846 13f79535-47bb-0310-9956-ffa450edef68