(MAINT) Sync recent changes to about_Arrays

[michaeltlombardi]

PR Summary

This change updates the 5.1, 7.2, and 7.5 files for about_Arrays to match the changes made in #11251, #11252, and #11253.

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 e7926e8:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Core/About/about_Arrays.md	✅Succeeded	View (powershell-5.1)
reference/7.2/Microsoft.PowerShell.Core/About/about_Arrays.md	✅Succeeded	View (powershell-7.2)
reference/7.5/Microsoft.PowerShell.Core/About/about_Arrays.md	✅Succeeded	View (powershell-7.5)

For more details, please refer to the build report.

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