Update icacls with PowerShell usage example

[Ferulaindig]

The original document made no mention of syntax formatting using PowerShell. It also contains explicit examples that when using inside PowerShell will return an error.

[prmerger-automator]

@Ferulaindig : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 2ed8400:

💡 Validation status: suggestions

File	Status	Preview URL	Details
WindowsServerDocs/administration/windows-commands/icacls.md	💡Suggestion		Details

WindowsServerDocs/administration/windows-commands/icacls.md

• Line 37, Column 1: [Suggestion: heading-empty - See documentation] Empty H3. Headings must have content.

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[learn-build-service-prod]

Learn Build status updates of commit 4d63472:

✅ Validation status: passed

File	Status	Preview URL	Details
WindowsServerDocs/administration/windows-commands/icacls.md	✅Succeeded

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[ShannonLeavitt]

#assign: @robinharwood, @Xelu86

@robinharwood @Xelu86
Can you review the proposed changes?

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

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