fixed a typo referencing EC2 in help ouptut
fixed a typo referencing EC2 in help ouptut

chef-partners/knife-vsphere,DennisBP/knife-vsphere,mheidenr/knife-vsphere,RallySoftware/knife-vsphere,tcicone/knife-vsphere,swalberg/knife-vsphere,NicCOConnor/knife-vsphere,hbombonato/knife-vsphere,lhandl/knife-vsphere,swalberg/knife-vsphere,valldeck/knife-vsphere,micolous/knife-vsphere,schubergphilis/knife-vsphere,rhadoo/knife-vsphere,afirth/knife-vsphere,adamleff/knife-vsphere,b-dean/knife-vsphere,dpattmann/knife-vsphere,dcondomitti/knife-vsphere,eklein/knife-vsphere,mobicorp/knife-vsphere,CoreMedia/knife-vsphere,tim95030/knife-vsphere,MI-LA01/knife-ovh-cloud,bellpeterm/knife-vsphere,ezrapagel/knife-vsphere