(GH-10487) Update New-FileCatalog

[michaeltlombardi]

PR Summary

This change:

• Updates the reference documentation for the New-FileCatalog cmdlet to reflect the new default value for CatalogVersion in 7.4.
• Makes minor fixes to grammar, syntax, and style across the versions.
• Resolves New-FileCatalog -CatalogVersion default value to 2 #10487

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 c29c152:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/5.1/Microsoft.PowerShell.Security/New-FileCatalog.md	✅Succeeded	View (powershell-5.1)
reference/7.2/Microsoft.PowerShell.Security/New-FileCatalog.md	✅Succeeded	View (powershell-7.2)
reference/7.3/Microsoft.PowerShell.Security/New-FileCatalog.md	✅Succeeded	View (powershell-7.3)
reference/7.4/Microsoft.PowerShell.Security/New-FileCatalog.md	✅Succeeded	View (powershell-7.4)

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel

[sdwheeler]

Closing this PR since this didn't ship in 7.4-rc.1.