[release-4.13] HOSTEDCP-1046: Add ImageDigestMirrorSet to Config API comment

[openshift-cherrypick-robot]

This is an automated cherry-pick of #2868

/assign bryan-cox

[openshift-ci-robot]

@openshift-cherrypick-robot: An error was encountered cloning bug for cherrypick for bug HOSTEDCP-1046 on the Jira server at https://issues.redhat.com/. No known errors were detected, please see the full error message for details.

Full error message.

request failed. Please analyze the request body for more details. Status code: 400: {"errorMessages":["Number value expected as the Sprint id."],"errors":{"customfield_12319749":"Operation value must be a string","customfield_12318341":"Operation value must be a string","customfield_12319751":"Operation value must be a string"}}

Please contact an administrator to resolve this issue, then request a bug refresh with /jira refresh.

In response to this:

This is an automated cherry-pick of #2868

/assign bryan-cox

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[openshift-ci]

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[enxebre]

/approve
/lgtm

[openshift-ci]

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