[docs / oneliner] update mmmu docs instruction (#9768)

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

benchmark/mmmu/README.md

@@ -39,8 +39,11 @@ You can use `--extra-request-body` to specify additional OpenAI request paramete
 python3 bench_sglang.py --extra-request-body '{"max_new_tokens": 128, "temperature": 0.01}'
 ```
 
-### Evaluate hf
+### Evaluate HF
 
 ```
 python benchmark/mmmu/bench_hf.py --model-path Qwen/Qwen2-VL-7B-Instruct
 ```
+
+# Profiling MMMU
+You should use the standard instructions found in the [dedicated profiling doc](../../docs/developer_guide/benchmark_and_profiling.md) if running this benchmark with the profile option. We recommend using `--concurrency 1` for consistency, which makes profiling and debugging easier.