Update README.md

README.md

@@ -22,10 +22,10 @@ Results files should have the following format and be stored as json files:
         "model_sha": "revision on the hub",
     },
     "results": {
-        "task_name": {
+        "retrieval": {
             "metric_name": score,
         },
-        "task_name2": {
+        "generation": {
             "metric_name": score,
         }
     }