(GH-10698) Update -Content parameter for Get-Authenticode in 7.4

[michaeltlombardi]

PR Summary

Prior to this change, the documentation for the -Content parameter of the Get-Authenticode cmdlet in version 7.4 incorrectly stated that the contents must be encoded as UTF-16LE. This was true in prior versions, but in 7.4 the cmdlet works with content of any valid and readable encoding.

This change:

• Updates the description for the -Content parameter to indicate that the encoding limitation is removed in PowerShell 7.4.
• Resolves Get-AuthenticodeSignature -Content parameter no longer requires UTF16LE #10698
• Fixes AB#187542

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 f8f7a06:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/7.4/Microsoft.PowerShell.Security/Get-AuthenticodeSignature.md	✅Succeeded	View (powershell-7.4)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel