Update ms.topic metadata

[gewarren]

Per new definitions:

ms.topic value	Definition
reference	Use for consistently structured documentation of a technical artifact, like an API or SDK, that’s entirely written by people or is a combination of manual writing and autogeneration.
generated-reference	Use for consistently structured documentation of a technical artifact, like an API or SDK, that’s written entirely via autogeneration. Files are overwritten by autogeneration so updates are made at source.

Contributes to dotnet/docs#44692

[learn-build-service-prod]

Learn Build status updates of commit 91f7e3a:

✅ Validation status: passed

File	Status	Preview URL	Details
.github/policies/disallow-edits.yml	✅Succeeded
docfx.json	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[BillWagner]

This LGTM @gewarren

Let's