update

aicrowd.json

 {
     "challenge_id": "esci-challenge-for-improving-product-search",
-    "task": "task_2_multiclass_product_classification",
+    "task": "task_3_product_substitute_identification",
     "gpu": true,
     "authors": ["aicrowd-username"],
-    "description": "task_3_product_substitute_identification",
+    "description": "task_2_multiclass_product_classification",
     "license": "MIT"
 }
\ No newline at end of file