Bring 2.0 up to parity, a bit, with how much info we provide to

the admin regarding valid values for AcceptMutex. Should also
tell 'em what "default" actually maps to, but that can wait.

PR:
Obtained from:
Submitted by:
Reviewed by:


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@94055 13f79535-47bb-0310-9956-ffa450edef68