Merge r1245717 :

Mention mod_heartmonitor/mod_lbmethod_heartbeat, mod_sed, mod_auth_form,
mod_session.
Remove mod_reqtimeout (already in 2.2), mark mod_lua as experimental.
Mention more mod_rewrite improvements.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1245721 13f79535-47bb-0310-9956-ffa450edef68