wrong docker run command

[ZhangTao1596]

doc: https://github.com/ethereum/testeth/blob/develop/doc/generating_tests.rst

Preparing testeth and LLL

Option 1: Using a docker image

I think the docker run command missing testeth between holiman/testeth and -t, should be:

docker run -v <LOCAL_PATH_TO_ETH_TESTS>:/foobar holiman/testeth testeth -t GeneralStateTests/stCallCodes -- --singletest callcall_00 --singlenet EIP150 -d 0 -g 0 -v 0 --statediff --verbosity 5 --testpath /foobar