[enterprise-4.12] OSSM-5605: image name example for service mesh must-gather is confusing

[openshift-cherrypick-robot]

This is an automated cherry-pick of #70280

/assign bburt-rh

[openshift-ci-robot]

@openshift-cherrypick-robot: Ignoring requests to cherry-pick non-bug issues: OSSM-5605

In response to this:

This is an automated cherry-pick of #70280

/assign bburt-rh

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[ocpdocs-previewbot]

🤖 Tue Jan 16 16:26:29 - Prow CI generated the docs preview: https://70337--ocpdocs-pr.netlify.app

[openshift-ci]

@openshift-cherrypick-robot: all tests passed!

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