Fixes #12432 - Fix syntax example

[sdwheeler]

PR Summary

Fix syntax example

• Fixes AB#498737
• Fixes Incorrect syntax in Static constructor and Constructors for derived classes topics #12432

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 contributor's guide.
• Style: This PR adheres to the style guide.

[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit 8674e94:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Core/About/about_Classes_Constructors.md	✅Succeeded	View (powershell-5.1)
reference/7.4/Microsoft.PowerShell.Core/About/about_Classes_Constructors.md	✅Succeeded	View (powershell-7.4)
reference/7.5/Microsoft.PowerShell.Core/About/about_Classes_Constructors.md	✅Succeeded	View (powershell-7.5)
reference/7.6/Microsoft.PowerShell.Core/About/about_Classes_Constructors.md	✅Succeeded	View (powershell-7.6)

For more details, please refer to the build report.