(GH-10088) Add example for normalizing Read-Host input

[michaeltlombardi]

PR Summary

Prior to this change, the documentation for the Read-Host cmdlet didn't include information about trimming the input. The cmdlet doesn't have a built-in way to trim extra spaces from the input value, which is an arbitrary string.

This change:

• Adds an example to Read-Host showing how user input may need to normalized before it can be used. It also shows how a reader can apply some simple normalizing techniques to clean up the input.
• Resolves Read-Host: Show how to trim leading and trailing whitespace from user input #10088
• Fixes AB#91532

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.

[sdwheeler]

See suggested wording. Otherwise, looks good. Copy to all versions.

[learn-build-service-prod]

Learn Build status updates of commit 15fb612:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Utility/Read-Host.md	✅Succeeded	View (powershell-5.1)
reference/7.2/Microsoft.PowerShell.Utility/Read-Host.md	✅Succeeded	View (powershell-7.2)
reference/7.3/Microsoft.PowerShell.Utility/Read-Host.md	✅Succeeded	View (powershell-7.3)
reference/7.4/Microsoft.PowerShell.Utility/Read-Host.md	✅Succeeded	View (powershell-7.4)

For more details, please refer to the build report.

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[mklement0]

🙏