docs: update tutorial docs (#1912)

* docs: update tutorial docs

* Update evaluation/TUTORIAL.md

---------

Co-authored-by: Engel Nyst <enyst@users.noreply.github.com>

evaluation/TUTORIAL.md

@@ -164,3 +164,19 @@ You can start the evaluation by running:
 ./run_infer.sh eval_gpt_4o_2024_05_13
 ```
 Where `eval_gpt_4o_2024_05_13` is the model config you defined on the config.toml.
+Like this:
+
+```toml
+[core]
+...
+
+[llm]
+model="gpt-4-32k"
+...
+
+[eval_gpt_4o_2024_05_13]
+model="gpt-4o-2024-05-13"
+api_key="sk-xxx"
+```
+
+If `[eval_gpt_4o_2024_05_13]` is not present, it will default to using the model configured in `[llm]`.