Adds a recommendation that rewrite logging be consulted for more details

on how rewrite is looking at URIs. refs https://issues.apache.org/bugzilla/show_bug.cgi?id=30021


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1180935 13f79535-47bb-0310-9956-ffa450edef68