Fix instruction to mark node type as non-primary

[skyiky]

Fix incorrect grammar

[prmerger-automator]

@skyiky : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit e116b2b:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/service-fabric/service-fabric-how-to-remove-node-type.md	✅Succeeded

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[ShannonLeavitt]

@tomvcassidy

Can you review the proposed changes?

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#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[Copilot]

Pull Request Overview

This PR corrects a documentation error in the Service Fabric node type removal guide. The change fixes the wording of step 3 to accurately reflect the action being performed.

• Corrected the instruction text from "Unmark the node-type as non-primary" to "Mark the node type as non-primary"

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