Fix the multi_news dataset.

PiperOrigin-RevId: 795632521

Author: The TensorFlow Datasets Authors

tensorflow_datasets/datasets/multi_news/CITATIONS.bib

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+@misc{alex2019multinews,
+    title={Multi-News: a Large-Scale Multi-Document Summarization Dataset and Abstractive Hierarchical Model},
+    author={Alexander R. Fabbri and Irene Li and Tianwei She and Suyi Li and Dragomir R. Radev},
+    year={2019},
+    eprint={1906.01749},
+    archivePrefix={arXiv},
+    primaryClass={cs.CL}
+}

tensorflow_datasets/datasets/multi_news/README.md

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+Multi-News, consists of news articles and human-written summaries
+of these articles from the site newser.com.
+Each summary is professionally written by editors and
+includes links to the original articles cited.
+
+There are two features:
+  - document: text of news articles seperated by special token "|||||".
+  - summary: news summary.

tensorflow_datasets/datasets/multi_news/TAGS.txt

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+# coding=utf-8
+# Copyright 2025 The TensorFlow Datasets Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+

tensorflow_datasets/datasets/multi_news/__init__.py

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+https://huggingface.co/datasets/alexfabbri/multi_news/raw/main/data/test.src.cleaned	133	d04c4581d52321a30c246d2caa72853ee7f28c6b7a3985ee436f54c4bc264315	test.src.cleaned
+https://huggingface.co/datasets/alexfabbri/multi_news/raw/main/data/test.tgt	132	afba4aa26d95bb557c0eaa0cb8f7495af2104f1e43f4b5f9ef429b8752477abd	test.tgt
+https://huggingface.co/datasets/alexfabbri/multi_news/raw/main/data/train.src.cleaned	134	75f87b786ff1982bf1bd5803c6a7377d1834b81956ac680a6955789ba047cc0b	train.src.cleaned
+https://huggingface.co/datasets/alexfabbri/multi_news/raw/main/data/train.tgt	133	9f1e9b290a6aae1aa67bd5b361c934ee9db32486e5cd97d83184c097ef8b27e5	train.tgt
+https://huggingface.co/datasets/alexfabbri/multi_news/raw/main/data/val.src.cleaned	133	8df3ef6bd1882094de8120fa635c3abf758e10427f81f306aaa4786df7b57861	val.src.cleaned
+https://huggingface.co/datasets/alexfabbri/multi_news/raw/main/data/val.tgt	132	9c0377a443ea92b17449f7df17f1cdfa7c7ebbfe3a45f2f8cd7b3e0ffb47b1df	val.tgt