Remove reference to domainmapping yaml

[julz]

The DomainMapping feature is now beta, and therefore built in to the
main yaml files. These links are therefore now 404s.

/assign @dprotaso @omerbensaadon

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[dprotaso]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, julz

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[dprotaso]

@julz do we want to cherry pick this?

[julz]

Oh good catch @dprotaso, yes

/cherry-pick release-0.24

[knative-prow-robot]

@julz: once the present PR merges, I will cherry-pick it on top of release-0.24 in a new PR and assign it to you.

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In response to this:

Oh good catch @dprotaso, yes

/cherry-pick release-0.24

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[knative-prow-robot]

@julz: new pull request created: #3983

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In response to this:

Oh good catch @dprotaso, yes

/cherry-pick release-0.24

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