Update dataset_infos.json

dataset_infos.json

@@ -60,15 +60,7 @@
             "num_examples":10,
             "dataset_name":"multi_document_summarization"
          }
-      },
-      "download_checksums":{
-         "https://github.com/arka0821/multi_document_summarization/blob/master/data/train.json.gz":{
-         },
-         "https://github.com/arka0821/multi_document_summarization/blob/master/data/test.json.gz":{
-         },
-         "https://github.com/arka0821/multi_document_summarization/blob/master/data/val.json.gz":{
-         }
-      },
+      }
       "post_processing_size":null
    }
 }