Add new diagnostics for with

[BillWagner]

Fixes #51441

The feature for collection expression arguments adds these six diagnostic codes.

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Internal previews

📄 File	🔗 Preview link
docs/csharp/language-reference/compiler-messages/array-declaration-errors.md	Resolve errors and warnings in array and collection declarations and initialization expressions
docs/csharp/language-reference/toc.yml	docs/csharp/language-reference/toc
docs/csharp/misc/sorry-we-don-t-have-specifics-on-this-csharp-error.md	Coming in C# 15

[Copilot]

Pull request overview

This PR wires up documentation for the new with(...) collection expression argument diagnostics and removes them from the generic “sorry, we don’t have specifics” catch-all page. It also updates TOC metadata so the new diagnostics are discoverable from the language reference.

Changes:

• Removed CS9354–CS9359 from the generic sorry-we-don-t-have-specifics-on-this-csharp-error.md list now that they have dedicated coverage.
• Added CS9354–CS9359 to array-declaration-errors.md, including F1/helpviewer keywords, the error list, and guidance on how to resolve the diagnostics, and updated ms.date.
• Updated language-reference/toc.yml display names to surface the new diagnostics in navigation (though currently pointing them at the inline arrays entry instead of the array/collection declarations entry).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
docs/csharp/misc/sorry-we-don-t-have-specifics-on-this-csharp-error.md	Updates ms.date, adds C# version grouping comments, and removes CS9354–CS9359 from the undocumented diagnostics list now that they are documented elsewhere.
docs/csharp/language-reference/toc.yml	Extends the inline arrays compiler-messages TOC entry’s displayName list to include CS9354–CS9359, but does not yet add them to the array declarations entry where the new content actually lives.
docs/csharp/language-reference/compiler-messages/array-declaration-errors.md	Adds CS9354–CS9359 to F1/helpviewer keywords, the “covered errors” list, and the guidance section for collection expression/initializer diagnostics, and updates ms.date and metadata accordingly.

[BillWagner]

@adegeo This is ready for review.