fix doc link

git-svn-id: https://svn.apache.org/repos/asf/flex/site/trunk@1614246 13f79535-47bb-0310-9956-ffa450edef68
add cache ids for download md5 monitoring tool

git-svn-id: https://svn.apache.org/repos/asf/flex/site/trunk@1614253 13f79535-47bb-0310-9956-ffa450edef68