Fix alignment issue in example of migrate-az-14.0.0.md

[isra-fel]

PR Summary

This pull request makes a small update to the PowerShell script in the docs-conceptual/azps-14.1.0/migrate-az-14.0.0.md file regarding the migration guide of the Get-AzAccessToken breaking change

Here's the file in the source repo https://github.com/Azure/azure-powershell/blob/main/documentation/migration-guides/Az.14.0.0-migration-guide.md

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 ef7d8ad:

✅ Validation status: passed

File	Status	Preview URL	Details
docs-conceptual/azps-14.1.0/migrate-az-14.0.0.md	✅Succeeded	View (azps-14.1.0)

For more details, please refer to the build report.

[github-actions]

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[mikefrobbins]

LGTM