Update backup-restore-environments.md

[Jaqiness]

Going through this process at the moment - have submitted changes to other documentation relating to copying and restoring environments.

[learn-build-service-prod]

Learn Build status updates of commit 27cc8ed:

💡 Validation status: suggestions

File	Status	Preview URL	Details
power-platform/admin/backup-restore-environments.md	💡Suggestion		Details

power-platform/admin/backup-restore-environments.md

• Line 325, Column 36: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/power-platform/admin/vnet-support-overview' will be broken in isolated environments. Replace with a relative link.

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