Update about_pwsh

[sdwheeler]

PR Summary

Update about_pwsh

• Fixes AB#125229
• Related to:
  • Update man page to match current help for pwsh PowerShell/PowerShell#19993
  • The man page for pwsh on Linux/macOS is not in sync with pwsh -? PowerShell/PowerShell#19990

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 ae63a4a:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Core/About/about_PowerShell_exe.md	✅Succeeded	View (powershell-5.1)
reference/7.2/Microsoft.PowerShell.Core/About/about_Pwsh.md	✅Succeeded	View (powershell-7.2)
reference/7.3/Microsoft.PowerShell.Core/About/about_Pwsh.md	✅Succeeded	View (powershell-7.3)
reference/7.4/Microsoft.PowerShell.Core/About/about_Pwsh.md	✅Succeeded	View (powershell-7.4)

For more details, please refer to the build report.

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