Fixed a typo in Format-SecureBootUEFI.md

[sircompo]

PR Summary

This corrects a typo by removing a spurious letter g.

PR Checklist

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

[sircompo]

NB - Related to #3077 - if still open, that PR should be reviewed alongside this one.

[learn-build-service-prod[bot]]

Learn Build status updates of commit 276ca11:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
docset/winserver2025-ps/SecureBoot/Format-SecureBootUEFI.md	:white_check_mark:Succeeded	View (WindowsServer2025-ps)

For more details, please refer to the build report.