Document breaking change from CVE

[sdwheeler]

PR Summary

Document breaking change from CVE

• Fixes AB#540452

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 contributor's guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

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[Copilot]

Pull request overview

This PR documents a breaking change introduced by a security update for CVE-2025-54100, which modifies the default behavior of the Invoke-WebRequest cmdlet to require user confirmation before parsing web page content that might contain executable scripts.

• Updates the warning documentation to describe the new confirmation prompt behavior
• Adds details about the security update and how to bypass the prompt using -UseBasicParsing
• Updates the documentation date to reflect the current revision

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[learn-build-service-prod]

Learn Build status updates of commit 7e9ea02:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Utility/Invoke-WebRequest.md	✅Succeeded	View (powershell-5.1)

For more details, please refer to the build report.