Add instructions for unintalling brew cask

[sdwheeler]

PR Summary

Add instructions for unintalling brew cask

• Fixes AB#562538

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

Updates PowerShell conceptual documentation navigation and macOS installation guidance, improving the Homebrew installation flow and keeping metadata current.

Changes:

• Removes the default-expanded setting from the “What’s New in PowerShell” TOC node.
• Updates ms.date and adds Homebrew cask-uninstall guidance before installing the Homebrew formula.
• Moves the Homebrew support “IMPORTANT” callout to appear before the installation steps.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
reference/docs-conceptual/toc.yml	Adjusts TOC behavior by removing expanded: true from the “What’s New” section.
reference/docs-conceptual/install/alternate-install-methods.md	Updates metadata and improves Homebrew instructions (callout placement + cask uninstall steps).

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[learn-build-service-prod]

Learn Build status updates of commit d1f1cd7:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/install/alternate-install-methods.md	✅Succeeded	View (>=powershell-5.1)
reference/docs-conceptual/toc.yml	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

[learn-build-service-prod]

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