Updating ms.topic values for manual reference topics

[robinharwood]

PR Summary

This pull request includes a small change to the docset/docfx.json file. The change updates the ms.topic metadata value from "managed-reference" to "reference" to better align with the content type. This is a revised definition. The 'refereence' slug is used 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.

Change in metadata:

• docset/docfx.json: Updated ms.topic from "managed-reference" to "reference".

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the contributors guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

Learn Build status updates of commit dc655df:

✅ Validation status: passed

File	Status	Preview URL	Details
docset/docfx.json	✅Succeeded

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[robinharwood]

Build validation complete, merging.