Document TunnelType parameter restrictions for New-NetIPsecRule

[dallasbrooks]

PR Summary

Adding documentation for TunnelType parameter restrictions to the New-NetIPSecRule documentation.

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.

This is related to #4053

[learn-build-service-prod]

PoliCheck Scan Report

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✅ No issues found

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[learn-build-service-prod]

Learn Build status updates of commit b3543a4:

✅ Validation status: passed

File	Status	Preview URL	Details
docset/winserver2025-ps/NetSecurity/New-NetIPsecRule.md	✅Succeeded	View (WindowsServer2025-ps)

For more details, please refer to the build report.