Cross-link Thread.Abort articles to SYSLIB0006

[Copilot]

~10 conceptual threading articles mention Thread.Abort and discourage its use, but none linked back to the SYSLIB0006 obsoletions article that explains why it's unsupported in .NET 5+.

Changes

• managed-threading-best-practices.md — Extended the "Don't use Thread.Abort" bullet with .NET 5+ obsolete/PlatformNotSupportedException note, SYSLIB0006 link, and CancellationToken as the alternative
• exceptions-in-managed-threads.md — Clarified .NET Framework only bullet applies only to Framework; added .NET 5+ behavior and SYSLIB0006 link
• the-managed-thread-pool.md — Added .NET Framework only scope and SYSLIB0006 link to ThreadAbortException bullet
• pausing-and-resuming-threads.md — Added SYSLIB0006 link alongside existing destroying-threads.md reference
• using-threads-and-threading.md — Split one overlong paragraph into two (Framework vs. .NET 5+); updated "not supported in .NET Core" → "not supported in .NET 5 and later"; added SYSLIB0006 link
• managed-and-unmanaged-threading-in-windows.md — Added [!NOTE] callout after Win32 mapping table intro noting Thread.Abort throws PlatformNotSupportedException in .NET 5+ with SYSLIB0006 link
• destroying-threads.md — Added SYSLIB0006 to See also section alongside the existing breaking-change article link

Original prompt

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This section details on the original issue you should resolve

<issue_title>Remark about Thread.Abort</issue_title>
<issue_description>I did a quick check in our conceptual docs and we have ~10 articles that mention Thread.Abort. Most seem to discourage its use. Should we link those articles back to this one?

Originally posted by @BillWagner in #21156 (comment)</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remark about Thread.Abort #21170

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Internal previews

📄 File	🔗 Preview link
docs/standard/threading/destroying-threads.md	docs/standard/threading/destroying-threads
docs/standard/threading/exceptions-in-managed-threads.md	docs/standard/threading/exceptions-in-managed-threads
docs/standard/threading/managed-and-unmanaged-threading-in-windows.md	docs/standard/threading/managed-and-unmanaged-threading-in-windows
docs/standard/threading/managed-threading-best-practices.md	docs/standard/threading/managed-threading-best-practices
docs/standard/threading/pausing-and-resuming-threads.md	docs/standard/threading/pausing-and-resuming-threads
docs/standard/threading/the-managed-thread-pool.md	docs/standard/threading/the-managed-thread-pool
docs/standard/threading/using-threads-and-threading.md	docs/standard/threading/using-threads-and-threading

[BillWagner]

This is ready for final review.

[Copilot]

Pull request overview

This PR updates .NET threading conceptual documentation to cross-link Thread.Abort guidance to the SYSLIB0006 obsoletion details, so readers understand why Thread.Abort is unsupported on modern .NET.

Changes:

• Adds/expands Thread.Abort guidance to distinguish .NET Framework behavior from .NET 5+ behavior and links to SYSLIB0006.
• Updates related articles with additional references (including Destroying threads and SYSLIB0006) where ThreadAbortException/Thread.Abort is mentioned.
• Refreshes article metadata (ms.date, and ai-usage where applicable).

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
docs/standard/threading/managed-threading-best-practices.md	Expands best-practices guidance for Thread.Abort with modern .NET behavior and SYSLIB0006 link.
docs/standard/threading/exceptions-in-managed-threads.md	Clarifies ThreadAbortException applicability and links to SYSLIB0006 for modern .NET behavior.
docs/standard/threading/the-managed-thread-pool.md	Adds .NET Framework scoping and SYSLIB0006 link for ThreadAbortException/Thread.Abort mention.
docs/standard/threading/pausing-and-resuming-threads.md	Adds SYSLIB0006 link alongside existing Thread.Abort/thread interruption discussion.
docs/standard/threading/using-threads-and-threading.md	Splits .NET Framework vs modern .NET guidance for forcibly terminating execution and adds SYSLIB0006 link.
docs/standard/threading/managed-and-unmanaged-threading-in-windows.md	Adds a note clarifying modern .NET behavior for Thread.Abort with a SYSLIB0006 link.
docs/standard/threading/destroying-threads.md	Adds SYSLIB0006 link to the See also section.