Merge r1306426, r1306841 from trunk:

Update worker mpm defaults to match documentation and built-in defaults.
As per https://issues.apache.org/bugzilla/show_bug.cgi?id=52102

Updated event mpm configuration to match the defaults in documentation and header definitions.
Updated prefork defaults to better match documentation and header definition.
Submitted by: humbedooh
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1364600 13f79535-47bb-0310-9956-ffa450edef68