[noissue] Recover metadata_signing documentation

[rayzilt]

Recover lost documentation

Fixes: #1644

[openshift-ci]

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[openshift-ci]

Hi @rayzilt. Thanks for your PR.

I'm waiting for a pulp member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

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