Merge r1770771 from trunk:

Describe new behavior of ServerLimit

This has changed a bit after the fix for PR 53555. Better wording is welcome.


Submitted by: sf
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1772336 13f79535-47bb-0310-9956-ffa450edef68