Update first-class-structs doc (#27189)
Update first-class-structs doc (#27189)


poizan42/coreclr,cshung/coreclr,cshung/coreclr,cshung/coreclr,cshung/coreclr,poizan42/coreclr,poizan42/coreclr,cshung/coreclr,poizan42/coreclr,cshung/coreclr,poizan42/coreclr,poizan42/coreclr