DOCS: Add note to AWS docs about why it might be used
DOCS: Add note to AWS docs about why it might be used

The biggest advantage of using Flannel AWS-VPC backend is that the AWS knows about that IP. That makes it possible to setup ELB to route directly to that container.
coreos/flannel,coreos/flannel,adiclepcea/flannel,adiclepcea/flannel,adiclepcea/flannel,coreos/flannel