[doc] Update and extend benchmarking.md
[doc] Update and extend benchmarking.md


Former-commit-id: 07a612abcba1749aa715f58139c14cccea93c446
syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2