Fix some typos (#1489)
Fix some typos (#1489)

1 delete duplicated "the the"
2 keypair->key pair (use same format for key pair in this doc)
c-knowles/kube-aws,kubernetes-incubator/kube-aws,HotelsDotCom/kube-aws,HotelsDotCom/kube-aws,kubernetes-incubator/kube-aws,c-knowles/kube-aws