Fix duplicate key in multi_news (#4164)

* fix duplicate key in multi_news

* also fix superb

* fix bad task tags

* again

Commit from https://github.com/huggingface/datasets/commit/b278fc3fd5d20642e0b924284d8e811a28c46da7

README.md

@@ -15,9 +15,9 @@ size_categories:
 source_datasets:
 - original
 task_categories:
-- conditional-text-generation
-task_ids:
 - summarization
+task_ids:
+- news-articles-summarization
 paperswithcode_id: multi-news
 ---