HOSTEDCP-1046: Add ImageDigestMirrorSet to Config API comment

[bryan-cox]

What this PR does / why we need it:
Add ImageDigestMirrorSet to Config API comment

Which issue(s) this PR fixes:
Fixes HOSTEDCP-1046

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.

[openshift-ci-robot]

@bryan-cox: This pull request references HOSTEDCP-1046 which is a valid jira issue.

In response to this:

What this PR does / why we need it:
Add ImageDigestMirrorSet to Config API comment

Which issue(s) this PR fixes:
Fixes HOSTEDCP-1046

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.

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[bryan-cox]

Addresses PR comment on 4.13 backport #2863 (comment).

[bryan-cox]

/cherry-pick release-4.13

[openshift-cherrypick-robot]

@bryan-cox: once the present PR merges, I will cherry-pick it on top of release-4.13 in a new PR and assign it to you.

In response to this:

/cherry-pick release-4.13

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[sjenning]

/approve
/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bryan-cox, sjenning

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[openshift-ci]

@bryan-cox: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-ibmcloud-iks	da698dc	link	false	/test e2e-ibmcloud-iks
ci/prow/e2e-ibmcloud-roks	da698dc	link	false	/test e2e-ibmcloud-roks

Full PR test history. Your PR dashboard.

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[openshift-cherrypick-robot]

@bryan-cox: new pull request created: #2870

In response to this:

/cherry-pick release-4.13

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.