Add placeholder for sla.conf sample in configs/. Please update with

correct information not to overload the switchboard with calls to sales.
 Thank you! ;-)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@39182 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/sla.conf.sample

+; this space is available for rent. Contact our sales people for more information.