(GH-10580) Remove extraneous example code

[michaeltlombardi]

PR Summary

Prior to this change, the about_Automatic_Variables article included an unnecessary Out-Null in a loop example. Using Out-Null in this case implies that the Reset() method returns output, which it doesn't.

This change:

• Removes the unnecessary Out-Null from the example.
• Resolves Unnecessary code in Example 4 of about_Automatic_Variables #10580
• Fixes AB#174090

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 d82e627:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Core/About/about_Automatic_Variables.md	✅Succeeded	View (powershell-5.1)
reference/7.2/Microsoft.PowerShell.Core/About/about_Automatic_Variables.md	✅Succeeded	View (powershell-7.2)
reference/7.3/Microsoft.PowerShell.Core/About/about_Automatic_Variables.md	✅Succeeded	View (powershell-7.3)
reference/7.4/Microsoft.PowerShell.Core/About/about_Automatic_Variables.md	✅Succeeded	View (powershell-7.4)

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