[DO NOT MERGE] Add API documentation for the NuGet.org deprecate API

[joelverhagen]

DO NOT MERGE YET.

This feature is currently in private preview, and we are evaluating the timeline of making it into a public preview.

[aortiz-msft]

@joelverhagen - Is this still needed or can we close?

[joelverhagen]

We still need this. I have not had the time to push the Deprecation API work through. Once I do, this PR will be able to move out of the draft state, take reviews, and be merged.

[learn-build-service-prod]

Learn Build status updates of commit d890f1e:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/api/package-publish-resource.md	✅Succeeded	View
docs/api/rate-limits.md	✅Succeeded	View
docs/TOC.md	✅Succeeded	View

For more details, please refer to the build report.

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