[multi-node/aws docs] update s3 artifact URL docs to recognize new s3 endpoint format
[multi-node/aws docs] update s3 artifact URL docs to recognize new s3 endpoint format

Requesting https://s3.amazonaws.com/bucket/path you get an xml blob telling you
to use the url https://bucket.s3.amazonaws.com/path instead

iflix-letsplay/kube-aws,AlmogBaku/kube-aws,AlmogBaku/kube-aws,iflix-letsplay/kube-aws,kubernetes-incubator/kube-aws,camilb/kube-aws,c-knowles/kube-aws,kubernetes-incubator/kube-aws,mumoshu/kube-aws,everpeace/kube-aws,danielfm/kube-aws,everpeace/kube-aws,HotelsDotCom/kube-aws,danielfm/kube-aws,HotelsDotCom/kube-aws,c-knowles/kube-aws,mumoshu/kube-aws,camilb/kube-aws