docs (storage): Remove outdated virtiofs live migration restriction

[aburdenthehand]

What this PR does / why we need it:

• Remove incorrect restriction that virtiofs does not support live migration as this was resolved in v1.5.0 (PR #13756)
• Fix markdown formatting for bullet point list rendering

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 #922

Special notes for your reviewer:

Created with Claude, from an issue that was created by a different Claude agent, from a list of inconsistencies generated from a comparison of the user-guide and the release notes.
Sceptical review of the issue revealed most of it was off track.
Al;so it looks as though a previous release note re: setting the EnableVirtioFsPVC featuregate was incorrect, which needs investigation.

Checklist

This checklist is not enforcing, but it's a reminder of items that could be relevant to every PR.
Approvers are expected to review this list.

• 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:

NONE

[kubevirt-bot]

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