[enterprise-4.15] OSDOCS-9284: adds RHEL 9.3 to MicroShift 4.15 docs

[openshift-cherrypick-robot]

This is an automated cherry-pick of #69960

/assign ShaunaDiaz

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: OSDOCS-9284

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In response to this:

This is an automated cherry-pick of #69960

/assign ShaunaDiaz

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[ocpdocs-previewbot]

🤖 Thu Jan 11 17:20:21 - Prow CI generated the docs preview: https://70122--ocpdocs-pr.netlify.app

[openshift-ci]

@openshift-cherrypick-robot: all tests passed!

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