Fix incorrect command in UPGRADING
Fix incorrect command in UPGRADING

haas db create -> haas-admin db create

Thanks to @henn for catching this.

henn/haas,SahilTikale/haas,henn/hil,henn/hil_sahil,kylehogan/hil,henn/hil,meng-sun/hil,kylehogan/hil,kylehogan/haas,meng-sun/hil,CCI-MOC/haas,henn/hil_sahil