Update docs for release mirrors.

[patrickdillon]

These are minor doc updates based on my review of #1910. It seemed better to open a PR for docs than hold that up for code review.

Minor corrections to comments and developer reference docs related to the oc adm release mirrors.

/cc @abhinavdahiya

[abhinavdahiya]

Thanks !

/lgtm

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[patrickdillon]

/test e2e-aws-upgrade

[openshift-ci-robot]

@patrickdillon: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/prow/e2e-openstack	a7ebcc4	link	/test e2e-openstack
ci/prow/e2e-aws-scaleup-rhel7	a7ebcc4	link	/test e2e-aws-scaleup-rhel7

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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