Merge r1438838 from https://svn.apache.org/repos/asf/httpd/httpd/trunk/:

try to emphasize that ErrorDocument nnn /foo doesn't send a HTTP redirect.




git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1438839 13f79535-47bb-0310-9956-ffa450edef68