[enterprise-4.14] OBSDOCS-910: clarify what CMO fields are available and supported for configuration

[bburt-rh]

Manual CP from #74265 to enterprise-4.14

[openshift-ci-robot]

@bburt-rh: This pull request references OBSDOCS-910 which is a valid jira issue.

In response to this:

Manual CP from #74265 to enterprise-4.14

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[ocpdocs-previewbot]

🤖 Mon Apr 08 17:47:02 - Prow CI generated the docs preview:

https://74358--ocpdocs-pr.netlify.app/
https://74358--ocpdocs-pr.netlify.app/openshift-enterprise/latest/monitoring/configuring-the-monitoring-stack.html

[openshift-ci]

@bburt-rh: all tests passed!

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