Fixes #12624 - Add more specific cases of sensitivity

[sdwheeler]

PR Summary

Add more specific cases of sensitivity

• Fixes AB#543404
• Fixes about_Case-Sensitivity lacks detail in a lot of areas #12624

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.

[Copilot]

Pull request overview

This PR addresses issue #12624 by substantially expanding the about_Case-Sensitivity.md documentation across four PowerShell versions (5.1, 7.4, 7.5, and 7.6). The changes transform a brief, Unix-focused document into a comprehensive reference covering case-sensitivity behavior throughout PowerShell.

Key changes include:

• Reorganized content structure with a guaranteed case-insensitive areas list and detailed special cases section
• Added comprehensive documentation for 14+ specific scenarios where case-sensitivity varies or behaves unexpectedly
• Included code examples demonstrating case-sensitive behavior in providers, cmdlets, operators, and .NET methods
• Converted to reference-style links for better maintainability

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 8 comments.

File	Description
reference/7.6/Microsoft.PowerShell.Core/About/about_Case-Sensitivity.md	Complete rewrite with expanded content, updated metadata date, added comprehensive special cases documentation with examples
reference/7.5/Microsoft.PowerShell.Core/About/about_Case-Sensitivity.md	Identical changes to 7.6 version with version-appropriate link
reference/7.4/Microsoft.PowerShell.Core/About/about_Case-Sensitivity.md	Identical changes to 7.6 version with version-appropriate link
reference/5.1/Microsoft.PowerShell.Core/About/about_Case-Sensitivity.md	Identical changes to 7.6 version with version-appropriate link, includes v5.1-specific Group-Object behavior notes

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[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit d57abf3:

✅ Validation status: passed

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

For more details, please refer to the build report.