Update policy-csp-deviceguard.md

[mgewida1]

Adding new policy: MachineIdentityIsolation

Why

• Closes #[Issue Number]

Changes

[learn-build-service-prod]

Learn Build status updates of commit 7cf1930:

⚠️ Validation status: warnings

File	Status	Preview URL	Details
windows/client-management/mdm/policy-csp-deviceguard.md	⚠️Warning		Details

windows/client-management/mdm/policy-csp-deviceguard.md

• Line 41, Column 27: [Warning: hard-coded-locale - See documentation] Link 'https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/manage/delegated-managed-service-accounts/credential-guard-protected-machine-accounts?source=recommendations' contains locale code 'en-us'. For localizability, remove 'en-us' from links to most Microsoft sites.
• Line 41, Column 27: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/en-us/windows-server/identity/ad-ds/manage/delegated-managed-service-accounts/credential-guard-protected-machine-accounts?source=recommendations' will be broken in isolated environments. Replace with a relative link.

For more details, please refer to the build report.

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[aczechowski]

Closing - sent internal email with more info