Add/Update data: multi_sum

[LorrinWWW]

Data Source

pretty_name: multi_sum
license:
  - ___LICENSE___
language:
  - ___LANGUAGE___
multilinguality:
  - ___monolingual/multilingual___
download_link:
  - https://drive.google.com/file/d/1iTGgpUXZURMhDt3i4RoswRQSuKI7cvTi/view?usp=share_link
source:
  - ___SOURCE___
task_types:
  - ___e.g., dialogue___
processed_by:
  - Huu
description:
  - summarization from multi-source, need to replace existing ones.

* Need to replace existing sum data.