Another 7.4 breaking change with Test-Json - JSON with comments

[o-l-a-v]

PR Summary

Test-Json has another undocumented breaking change with 7.4: JSON and JSONC with comments. Ref:

• Breaking Change: JSONC no longer works after 7.4.0 PowerShell/PowerShell#20782

I wrote about it. Did not add a ref, as I saw all other refs was to PRs, not issues.

Markdownlint also removed an unused ref.

PR Checklist

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Learn Build status updates of commit 9eb4378:

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Learn Build status updates of commit 71886dc:

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reference/docs-conceptual/whats-new/What-s-New-in-PowerShell-74.md	✅Succeeded	View (>=powershell-5.1)

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Learn Build status updates of commit f4cda83:

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