Remove OpenShift Virtualization note

[razo7]

Remove old note about interfering situation between old NMO and new, Medik8s, NMO.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: razo7

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/medik8s/node-maintenance-operator/blob/main/OWNERS)~~ [razo7] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[clobrano]

/lgtm

[razo7]

/retest