Spanish translation of summarization.mdx (#15947)
Spanish translation of summarization.mdx (#15947)

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Fixes #15947 (issue)

## Before submitting
- [x] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
- [x] Did you read the [contributor guideline](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md#start-contributing-pull-requests),
      Pull Request section?
- [x] Did you make sure to update the documentation with your changes? Here are the
      [documentation guidelines](https://github.com/huggingface/transformers/tree/main/docs), and
      [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).


## Who can review?
@omarespejel @osanseviero @sgugger
_The documentation is not available anymore as the PR was closed or merged._<|||||>Muchas gracias @AguilaCudicio por la traducción! Agregué algunos comentarios en el review.<|||||>Gracias @AguilaCudicio for the translation! 🚀

@sgugger LGTM :)