mem-hotplug: update user-guide

[acardace]

What this PR does / why we need it:

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 #

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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
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• [ ] 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:

Update memory hotplug user guide

[acardace]

/cc @jean-edouard

[vladikr]

/approve Looks good to me in general, I only have one question about the 1Gi guest mem size requirement.

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: vladikr

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Needs approval from an approver in each of these files: - ~~[docs/compute/OWNERS](https://github.com/kubevirt/user-guide/blob/main/docs/compute/OWNERS)~~ [vladikr] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[acardace]

/cc @jean-edouard can you take a look?