Add XSD.exe reference source code link to XML Schema Definition Tool docs

[Copilot]

Users looking to understand or extend XSD.exe behavior had no pointer to the source code. Adds the Microsoft Reference Source link to the "See also" section.

Changes

• docs/standard/serialization/xml-schema-definition-tool-xsd-exe.md
  • Added link to Xsd.exe source code (Reference Source) in the "See also" section
  • Updated ms.date and added ai-usage: ai-assisted to frontmatter

Original prompt

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This section details on the original issue you should resolve

<issue_title>XML Schema Definition Tool (Xsd.exe) source code</issue_title>
<issue_description>Is it possible to get the source code for XSD.exe ?
I am in the process of migrating a WCF application to REST and .NET core - and the ability to generate classes that de/serialize to both JSON and XML is required.
I have succeeded in doing this by hand (a huge effort) - but it would be extremely useful to have a tool like XSD.exe to generate the combined JSON / XML classes from the existing XSD files.
I am writing such a tool using c# - but it is re-inventing the wheel - source code for XSD.EXE would be very useful to me.

Thanks

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Document Details

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

• ID: 0d4cba5c-4b4c-5697-7f6c-7bd0b91c1b8f
• Version Independent ID: 29a29ddf-74db-2369-701d-c975c163c093
• Content: XML Schema Definition Tool (Xsd.exe)
• Content Source: docs/standard/serialization/xml-schema-definition-tool-xsd-exe.md
• Product: dotnet
• GitHub Login: @tdykstra
• Microsoft Alias: tdykstra</issue_description>

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

@tdykstra cc @StephenMolloy @HongGit @BillWagner The fix for this issue is to add a link to https://github.com/microsoft/referencesource/blob/master/xsd/microsoft/devapps/xsd/xsd.cs

• Fixes XML Schema Definition Tool (Xsd.exe) source code #19044

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Internal previews

📄 File	🔗 Preview link
docs/standard/serialization/xml-schema-definition-tool-xsd-exe.md	XML Schema Definition Tool (Xsd.exe)

[BillWagner]

This LGTM. It's ready for final review.

[Copilot]

Pull request overview

This PR updates the XML Schema Definition Tool (Xsd.exe) documentation to help users find the tool’s implementation by linking to the official Reference Source, and it refreshes article metadata.

Changes:

• Added a “See also” link to the Xsd.exe Reference Source (xsd.cs) on GitHub.
• Updated ms.date and added ai-usage: ai-assisted in the frontmatter.