Explain about application-networking.k8s.aws/federation in documentation

[wolfdate25]

I figured why my serviceexport resource doesn't work. Because I did not set the annotation like (application-networking.k8s.aws/federation and should be set to the value amazon-vpc-lattice)

The annotation application-networking.k8s.aws/federation: "amazon-vpc--lattice is not exists in documentation.

How about add this explaination?

[mikestvz]

@wolfdate25 Thanks for reporting it. We will look in to this and update appropriately.