Spanish translation of the file preprocessing.mdx
Hi, I made the translation of the **preprocessing.mdx** file to add it to the Spanish documentation (transformers/docs/source_es/). 
I will be waiting for any correction, thanks.
@omarespejel @LysandreJik @sgugger
_The documentation is not available anymore as the PR was closed or merged._<|||||>All good to me from the syntax point of view. Be careful though, as you PR files include the `training.mdx` so we can't know if there are small changes in it.<|||||>You're right, it was a mistake, It's just the preprocessing file<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.<|||||>Hi @yharyarias! Could you please review what Sylvain[ commented above](https://github.com/huggingface/transformers/pull/16299#issuecomment-1074021882)? We are almost done.<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.<|||||>Muchas gracias @yharyarias for the PR! 🤗 Please let me know if you wish to translate another one. Fixes issue #15947.

@sgugger LGTM :)