Fix wrong attribute in a vnet example

[tinova]

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Description

Minor change, the correct attribute name is "cluster_ids". Not opening a new issue since it's just a minor fix (but can do if required).

New or Affected Resource(s)

• opennebula_virtual_netwwork

Checklist

• I have updated the documentation (if needed)

[github-actions]

This pull request is stale because it has been open for 30 days with no activity and it is not in a milestone. Remove 'status: stale' label or comment, or this will be closed in 5 days.