Update volume migration doc

[alicefr]

What this PR does / why we need it: Update the volume migration with the information about the volume migration cancellation and recovery. Additionally, it also fix the title of the document

Release note:

NONE

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Once this PR has been reviewed and has the lgtm label, please ask for approval from alicefr. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

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

[alicefr]

/hold This can be merged after this PR https://github.com/kubevirt/kubevirt/pull/13030 is merged

[mhenriks]

/lgtm

[duyanyan]

/lgtm

[kubevirt-bot]

@duyanyan: changing LGTM is restricted to collaborators

In response to [this](https://github.com/kubevirt/user-guide/pull/840#issuecomment-2411495851): >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[kubevirt-bot]

Pull requests that are marked with lgtm should receive a review from an approver within 1 week.

After that period the bot marks them with the label needs-approver-review.

/label needs-approver-review

[alicefr]

/unhold Last PR has been merged

[alicefr]

@awels @duyanyan do you mind re-lgtm this?

[duyanyan]

/lgtm

[kubevirt-bot]

@duyanyan: changing LGTM is restricted to collaborators

In response to [this](https://github.com/kubevirt/user-guide/pull/840#issuecomment-2428980527): >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[awels]

/lgtm