Update cluster-file.md (#9588)
Update cluster-file.md (#9588)

Resolves - https://github.com/docker/docker.github.io/issues/9587
docker/docker.github.io,docker/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,docker/docker.github.io,docker/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io,thaJeztah/docker.github.io