NativeBitfieldAttribute has bizarre Doc attribute

[AArnott]

In the metadata, I see this:

[StructLayout(LayoutKind.Auto, CharSet = CharSet.Auto)]
[AttributeUsage(AttributeTargets.Field, AllowMultiple = true, Inherited = true)]
public sealed class NativeBitfieldAttribute : Attribute
{
	public extern NativeBitfieldAttribute([In] string name, [In] long offset, [In][Documentation("https://learn.microsoft.com/windows/win32/direct3dhlsl/dx-graphics-hlsl-length")] long length);
}

Note the presence of a [Documentation] attribute on the last parameter, which seemingly has nothing to do with that parameter (or the attribute in general).