(AB#156514) Remove reference to .NET Framework in about_Operators

[michaeltlombardi]

PR Summary

Prior to this change, the documentation in about_Operators referenced .NET Framework types and classes instead of .NET types and classes.

This change:

• Removes the incorrect qualifier as 7+ is built on .NET, not the .NET Framework.
• Fixes AB#156514
• Resolves ".NET Framework" should be ".NET" in about Operators? #10382

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 1ccc964:

✅ Validation status: passed

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

For more details, please refer to the build report.

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