evaluation.md instructions not working

[mikekgfb]

the evaluation.md file contains instructions that are not reproducible with torchchat/scripts/run-docs evaluation

At present that's fixed by exit 0 before the test commences. The reported error is missing a checkpoint, even though we pass a wellknown model into the torchchat command. I haven't had a chance to look yet, but suspect eval might not be properly integrated with the torchchat top level? (either on torchchat or eval side... even thought we have tests elsewhere)