Fix up the wording on the --with-module output printed during --help.

This has been a FAQ with some new 2.0 module developers.

Submitted by:	Thom May <thom@planetarytramp.net>
Reviewed by:	Aaron Bannert


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@93705 13f79535-47bb-0310-9956-ffa450edef68