fat reference type benchmarks are missing

[mastef]

These lead to 404

Also would be cool with a few more benchmarks for ref types

[mastef]

For future reference, since I found this repo again and was looking for them.

They still existed here :
https://github.com/NetFabric/LinqBenchmarks/blob/24a1e32d387779695d26b37aa4543a770411f604/Results/Enumerable.FatReferenceType.EnumerableFatReferenceTypeAny.md
https://github.com/NetFabric/LinqBenchmarks/blob/24a1e32d387779695d26b37aa4543a770411f604/Results/Enumerable.FatReferenceType.EnumerableFatReferenceTypeFirstOrDefault.md

They were removed here : e38d0c0