fix the sample worker configuration... it didn't make any sense

previously, and you'd see something like this when starting Apache
with it:

WARNING: MaxClients (8) must be at least as large
 large as ThreadsPerChild (25). Automatically
 increasing MaxClients to 25.

PR:              10430


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@97573 13f79535-47bb-0310-9956-ffa450edef68