external dns setup and required kubefed feature gate documentation

[rwong2888]

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: rwong2888
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[rwong2888]

/assign @irfanurrehman

[swiftslee]

Maybe we don't need the docs anymore. The kubefed community is going to remove this feature. See this pr.

[rwong2888]

Closing as per @yuswift 's comment that this feature is deprecating