XML documentation missing on some members in generated code

[JosefNemec]

I use Generator.Equals in a project that has XML doc generation enabled via GenerateDocumentationFile in csproj. This leads to the compiler generating CS1591 warning on every class that's missing XML doc comments. But since I also have warnings and errors enabled for release builds, I can't really build the project. This started happening since 4.0.0, it doesn't happen with 3.3.0.

To reproduce:

• enable <GenerateDocumentationFile>true</GenerateDocumentationFile>
• add any class with [Equatable] to the project
• try to compile the project

For example, this simple class:

[Equatable]
public partial class TestClass
{
    public string? Test { get; set; }
}

generates two CS1591 issues:

0>global__TestClass.Generator.Equals.g.cs(65,25): Warning CS1591 : Missing XML comment for publicly visible type or member 'TestClass.EqualityComparer'
0>global__TestClass.Generator.Equals.g.cs(67,40): Warning CS1591 : Missing XML comment for publicly visible type or member 'TestClass.EqualityComparer.Default'