Update cloud_monitoring.md
Update cloud_monitoring.md

Missing close brace on example of create_notification.
EdLeafe/pyrax,pratikmallya/pyrax,ddaeschler/pyrax,vikomall/pyrax,0dataloss/pyrax,rackspace/pyrax,sivel/pyrax,briancurtin/pyrax,roelvv/pyrax,opsdisk/pyrax,naemono/pyrax,rackerlabs/heat-pyrax,mandx/pyrax