Fix property typo in PowerShell example for Test Operations in DSC Resources Overview

[theznerd]

PR Summary

This change fixes a minor typo - exist is not a valid property on Microsoft.Windows/Registry - however the canonical _exist is

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]

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[learn-build-service-prod]

Learn Build status updates of commit 550c5a3:

✅ Validation status: passed

File	Status	Preview URL	Details
dsc/docs-conceptual/dsc-3.0/concepts/resources/overview.md	✅Succeeded	View (dsc-3.0)

For more details, please refer to the build report.

[Copilot]

Pull request overview

This PR fixes a typo in the DSC Resources Overview documentation where the property name exist was incorrectly used instead of the canonical property _exist in a PowerShell code example demonstrating the Test operation for the Microsoft.Windows/Registry resource.

Key Changes:

• Corrected the property name from "exist": true to "_exist": true in a Test operation example

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