Fix missing structure in PowerShell Example 2 for Update-MgDevice.md

[KonstantinMSFT]

Example 2 is missing the actual structure or syntax for how to pass extensionAttributes. Please include a working PowerShell snippet with the correct object structure.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

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[learn-build-service-prod]

Learn Build status updates of commit c0cbb63:

💡 Validation status: suggestions

File	Status	Preview URL	Details
microsoftgraph/graph-powershell-1.0/Microsoft.Graph.Identity.DirectoryManagement/Update-MgDevice.md	💡Suggestion	View (graph-powershell-1.0)	Details

microsoftgraph/graph-powershell-1.0/Microsoft.Graph.Identity.DirectoryManagement/Update-MgDevice.md

• Line 0, Column 0: [Suggestion: PSMD2Yaml_ContentMissing] Missing content in Microsoft.Graph.Identity.DirectoryManagement.Update-MgDevice cmdlet. Parameters lacking description: IsManagementRestricted

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[msewaweru]

@KonstantinMSFT - The content in this repo is autogenerated from the module repo. To ensure that your changes aren't overwritten in the next refresh, please update the example here.

I will proceed to close this PR.