Fix error messages issued from MPMs which explain where to change

compiled-in limits (e.g., ThreadsPerChild, MaxClients, StartTreads).

missing: the same minor changes for the 2nd BeOS MPM

Submitted by:	Greg Ames
Reviewed by:	Jeff Trawick


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85645 13f79535-47bb-0310-9956-ffa450edef68