Update New-Alias.md to fix typo, improve clarity, and add new example

[stevenjudd]

PR Summary

I found and corrected a typo in the Example 2 explanation. Also, since I was adjusting the Example 2 text, I modified the text for improved clarity. Also, I added Example 3 to show how to use a custom function with an alias since the New-Alias cmdlet will not take a Value other than a cmdlet or an executable in the form of a string value.

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

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

Learn Build status updates of commit 7edd136:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
reference/7.4/Microsoft.PowerShell.Utility/New-Alias.md	:white_check_mark:Succeeded	View (powershell-7.4)

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[sdwheeler]

@stevenjudd Thanks for the update. Can you make the same changes to the other versions?

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

Learn Build status updates of commit a9d63ba:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Utility/New-Alias.md	:white_check_mark:Succeeded	View (powershell-5.1)
reference/7.2/Microsoft.PowerShell.Utility/New-Alias.md	:white_check_mark:Succeeded	View (powershell-7.2)
reference/7.4/Microsoft.PowerShell.Utility/New-Alias.md	:white_check_mark:Succeeded	View (powershell-7.4)
reference/7.5/Microsoft.PowerShell.Utility/New-Alias.md	:white_check_mark:Succeeded	View (powershell-7.5)

For more details, please refer to the build report.

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