Consolidate bm25 note into Data structure and remove duplicate note in performance section

README.md

@@ -182,12 +182,10 @@ A lightweight, evaluation-ready subset of [CodeSearchNet](https://huggingface.co
 - `corpus`: `_id`, `text`
 - `queries`: `_id`, `text`
 - `qrels`: `query-id`, `corpus-id`, `score`
-- `bm25`: `query-id`, `corpus-ids`
-- `bm25`: A bm25 subset is included for first-stage retrieval and reranking experiments.
+- `bm25`: `query-id`, `corpus-ids` (A bm25 subset is included for first-stage retrieval and reranking experiments.)
 
 ## Performance Comparison Across Models
 
-A `bm25` subset is included for first-stage retrieval and reranking experiments.
 
 | Model | avg | Go | Java | JavaScript | PHP | Python | Ruby |
 |---|---:|---:|---:|---:|---:|---:|---:|