Update for RHCOS image file names

[github-actions]

This pull request updates the rhcos-table.md file

[ppc64le-cloud-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ppc64le-cloud-bot]

@github-actions[bot]: PR is not mergeable.

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[ppc64le-cloud-bot]

Hi @github-actions[bot]. Thanks for your PR.

I'm waiting for a ocp-power-automation 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. Regular contributors should join the org to skip this step.

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