Kubefed Documentation: Should have more detailed instructions on Join command

[allanjn-ca]

doc link: https://kubernetes.io/docs/admin/federation/kubefed/

This is a...

• Feature Request
• Bug Report

Problem:
Current instructions for joining a cluster to a federation isn't clear in terms of alias vs actual cluster context.

"The cluster name you supply to kubefed join must be a valid RFC 1035 label."

kubefed join gondor --host-cluster-context=rivendell --cluster-context=gondor_needs-no_king

Proposed Solution:
Indicate that cluster-name is an alias that you're creating and not the cluster name in kubeconfig.

Page to Update:
https://kubernetes.io/docs/admin/federation/kubefed/

cc: @madhusudancs

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[tengqm]

#2899 has addressed this issue.