Update persistent TPM & UEFI page to clarify storageclass requirements

[ianb-mp]

What this PR does / why we need it:

Update Persistent TPM and UEFI state to reflect the changes made in https://github.com/kubevirt/kubevirt/pull/11773

Also, small spelling fix: prerequesites -> prerequisites

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

Special notes for your reviewer:

Checklist

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• [ ] Design: A design document was considered and is present (link) or not required
• [ ] PR: The PR description is expressive enough and will help future contributors
• [ ] Code: Write code that humans can understand and Keep it simple
• [ ] Refactor: You have left the code cleaner than you found it (Boy Scout Rule)
• [ ] Upgrade: Impact of this change on upgrade flows was considered and addressed if required
• [ ] Testing: New code requires new unit tests. New features and bug fixes require at least on e2e test
• [ ] Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature / API change.
• [ ] Community: Announcement to kubevirt-dev was considered

Release note:

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[kubevirt-bot]

Hi @ianb-mp. Thanks for your PR.

I'm waiting for a kubevirt 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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[ianb-mp]

I was unsure if the following statement is still true - can anyone confirm?

Backend storage is currently incompatible with VM snapshot. It is planned to add snapshot support in the future.

[akalenyu]

I was unsure if the following statement is still true - can anyone confirm?

Backend storage is currently incompatible with VM snapshot. It is planned to add snapshot support in the future.

I think so - https://github.com/kubevirt/kubevirt/blob/effcb5b8e6fc951ec5c85ba47ad1daedc0173d79/pkg/virt-api/webhooks/validating-webhook/admitters/vmsnapshot-admitter.go#L166-L174 /cc @jean-edouard