Unity Package Manager Documentation Tools
Unity Package Manager Documentation Generation Tools as a Unity Package
https://docs.unity3d.com/Packages/com.unity.package-manager-doctools@1.13/manual/index.html
[ADDED MANUALLY] This is an internal Unity tool and will not be supported. The package documentation tools is a package manager ui extension that generates documentation for a package. This allows package developers to preview what their documentation will look like in its final published form.
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Unity Package Manager Documentation Generation Tools as a Unity Package
https://docs.unity3d.com/Packages/com.unity.package-manager-doctools@1.13/manual/index.html