Corrected PK terminology from "private key" to "Platform Key" in Format-SecureBootUEFI documentation

[APP32Piotr]

PR Summary

The current documentation incorrectly refers to PK as a "private key" in Example 1 and its description. According to the UEFI specification, PK stands for Platform Key

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]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 and severity-2 issues. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

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[learn-build-service-prod]

Learn Build status updates of commit 2da07fe:

✅ Validation status: passed

File	Status	Preview URL	Details
docset/winserver2019-ps/SecureBoot/Format-SecureBootUEFI.md	✅Succeeded	View (WindowsServer2019-ps)

For more details, please refer to the build report.