Changed promotional URL
Changed promotional URL

Changed promotional URL to send to: https://www.packet.net/promo/coreos/
coreos/docs,atxwebs/docs,joshix/docs,hkjn/docs-1,robszumski/docs,michelleN/docs,bq-xiao/docs,endocode/coreos-docs,jonboulle/docs,mjg59/docs,marineam/coreos-docs