linkify internal <directive> tags


git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1568652 13f79535-47bb-0310-9956-ffa450edef68
xform


git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1568653 13f79535-47bb-0310-9956-ffa450edef68