Add mention of mod_log_config and BufferedLogs, as per

https://issues.apache.org/bugzilla/show_bug.cgi?id=50110


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@1028764 13f79535-47bb-0310-9956-ffa450edef68