docs out of date

[rustam-e]

Describe the bug

cods at https://github.com/openai/evals/blob/main/docs/custom-eval.md are out of date:

1. the sample in the loop is an array so instead of

                   {"role": "system", "content": sample["problem"], "name": "example_user"},
                   {"role": "system", "content": sample["answer"], "name": "example_assistant"},
               ]
           else:
               prompt += [{"role": "user", "content": sample["problem"]}]```

the code should be:

                prompt += [
                    {"role": "system", "content": sample[0]["content"], "name": "example_user"},
                    {"role": "system", "content": sample[1]["content"], "name": "example_assistant"},
                ]
            else:
                prompt += [{"role": "user", "content": sample[0]["content"]}]

2. the check_sampled_text function doesn't exist after 64fb72a

To Reproduce

1. try running code in https://github.com/openai/evals/blob/main/docs/custom-eval.md

Code snippets

No response

OS

macOs

Python version

Python 3.10

Library version

1.0.3.post1