Append warning-behavior properties

[rainersigwald]

Specifying the current value for the property is a best practice to avoid accidentally overwriting an existing value.

[rainersigwald]

@zivkan one small nit to the very nice how-to-keep-these-as-warnings doc section.

[learn-build-service-prod]

Learn Build status updates of commit 5323679:

💡 Validation status: suggestions

File	Status	Preview URL	Details
docs/concepts/Auditing-Packages.md	💡Suggestion	View	Details

docs/concepts/Auditing-Packages.md

• Line 133, Column 7: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/nuget/consume-packages/Central-Package-Management#transitive-pinning' will be broken in isolated environments. Replace with a relative link.
• Line 134, Column 3: [Suggestion: docs-link-absolute - See documentation] Absolute link 'https://learn.microsoft.com/nuget/concepts/auditing-packages#excluding-advisories' will be broken in isolated environments. Replace with a relative link.

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