Update Import-PfxCertificate.md

[Romanicus]

Update example because username was the same as password

PR Summary

Change the username of the first example because it was not a user name, it was the same thats written in password.

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]

Learn Build status updates of commit d5d025d:

✅ Validation status: passed

File	Status	Preview URL	Details
docset/winserver2025-ps/pki/Import-PfxCertificate.md	✅Succeeded	View (WindowsServer2025-ps)

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