Link copying-and-pinning article to existing code examples

[Copilot]

The Copying and Pinning interop article had no code examples, despite existing repo content covering both GCHandle pinning patterns and the C# fixed statement.

Changes

• Inline cross-reference — Added a link in the GCHandle pinning paragraph pointing directly to the Keeping managed objects alive section of the native interop best practices article, which has concrete GCHandle.Alloc / AddrOfPinnedObject / Free examples.
• See also links — Added two entries:
  • Native interoperability best practices — GCHandle pinning and callback patterns
  • fixed statement (C# reference) — pinning arrays, spans, strings, and variables via unsafe code
• Frontmatter — Updated ms.date and added ai-usage: ai-assisted.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Request example code for "copying and pinning"</issue_title>
<issue_description>
[Enter feedback here]
Please provide example code on how to use the procedures on this page.

---

Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: b577bfbf-e6cf-2008-2f84-53df0025dbd2
• Version Independent ID: df1ebd4b-e0fd-6461-ab17-f9e1391ad329
• Content: Copying and Pinning
• Content Source: docs/framework/interop/copying-and-pinning.md
• Product: dotnet-framework
• GitHub Login: @gewarren
• Microsoft Alias: dotnetcontent</issue_description>

<agent_instructions>We have examples of using these features in the repo. Linking would be better than replication here.</agent_instructions>

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

• Fixes Request example code for "copying and pinning" #21764

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docs/framework/interop/copying-and-pinning.md	Copying and Pinning

[BillWagner]

This is ready for final review

[Copilot]

Pull request overview

Updates the .NET Framework interop article Copying and Pinning to point readers to existing pinning examples elsewhere in the docs set, instead of duplicating new samples in this page.

Changes:

• Adds an inline link from the GCHandle pinning paragraph to the “Keeping managed objects alive” examples in native interop best practices.
• Expands See also with links to native interop best practices and the C# fixed statement reference.
• Updates frontmatter (ms.date) and adds ai-usage: ai-assisted.

[gewarren]

Suggested change

	- [fixed statement (C# reference)](../../csharp/language-reference/statements/fixed.md)
	- [`fixed` statement (C# reference)](../../csharp/language-reference/statements/fixed.md)