Update Register-PSResourceRepository.md - Example 4

[robinmalik]

Relates to challenges faced getting started with registering package repositories using authentication, as detailed here: PowerShell/PSResourceGet#1822

PR Summary

Hopefully provides a little extra clarity for example 4. From my reading here it wasn't clear anywhere that the secret must be stored as a PSCredential object, and so I expected Find-PSResource to use the name of the secret and the value of the secret as username/password. This wasn't the case.

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][contrib].
• Style: This PR adheres to the [style guide][style].

[learn-build-service-prod]

Learn Build status updates of commit 51c9618:

✅ Validation status: passed

File	Status	Preview URL	Details
powershell-gallery/powershellget-3.x/Microsoft.PowerShell.PSResourceGet/Register-PSResourceRepository.md	✅Succeeded	View (powershellget-3.x)

For more details, please refer to the build report.

For any questions, please:

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[github-actions]

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[learn-build-service-prod]

Learn Build status updates of commit 46393f9:

✅ Validation status: passed

File	Status	Preview URL	Details
powershell-gallery/powershellget-3.x/Microsoft.PowerShell.PSResourceGet/Register-PSResourceRepository.md	✅Succeeded	View (powershellget-3.x)

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