[OSP] Add API endpoint accessibility note

[maxwelldb]

Which section(s) is the issue in?

#22392 (review)

What needs fixing?

Add something that communicates this where relevant:

For example, in an OpenStack deployment, the system should be able to reach the URL
http://api.cluster.domain.name:22623. This maybe tested by using a tool like curl,
curl --insecure https://api.clustername.basedomain.name:22623, and verifying it does not time out.

[openshift-bot]

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Mark the issue as fresh by commenting /remove-lifecycle stale.
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/lifecycle stale

[maxwelldb]

/remove-lifecycle stale

[openshift-bot]

Issues go stale after 90d of inactivity.

Mark the issue as fresh by commenting /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.
Exclude this issue from closing by commenting /lifecycle frozen.

If this issue is safe to close now please do so with /close.

/lifecycle stale

[maxwelldb]

/remove-lifecycle stale