Documentation: Spanish translation of fast_tokenizers.mdx
Author: jloayza10
Pull request: yes

# What does this PR do?

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Fixes #15947
Translation to Spanish of fast_tokenizers.mdx

## 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] Was this discussed/approved via a Github issue or the [forum](https://discuss.huggingface.co/)? #15947


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Models:

- albert, bert, xlm: @LysandreJik
- blenderbot, bart, marian, pegasus, encoderdecoder,  t5: @patrickvonplaten, @patil-suraj
- longformer, reformer, transfoxl, xlnet: @patrickvonplaten
- fsmt: @stas00
- funnel: @sgugger
- gpt2: @patrickvonplaten, @LysandreJik
- rag: @patrickvonplaten, @lhoestq
- tensorflow: @LysandreJik

Library:

- benchmarks: @patrickvonplaten
- deepspeed: @stas00
- ray/raytune: @richardliaw, @amogkam
- text generation: @patrickvonplaten
- tokenizers: @n1t0, @LysandreJik
- trainer: @sgugger
- pipelines: @LysandreJik

Documentation: @sgugger

HF projects:

- datasets: [different repo](https://github.com/huggingface/datasets)
- rust tokenizers: [different repo](https://github.com/huggingface/tokenizers)

Examples:

- maintained examples (not research project or legacy): @sgugger, @patil-suraj
- research_projects/bert-loses-patience: @JetRunner
- research_projects/distillation: @VictorSanh

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Comments:
Thank you @jloayza10! Could you please add `fast_tokenizers` to [`transformers/docs/source/es/_toctree.yml`](https://github.com/huggingface/transformers/blob/main/docs/source/es/_toctree.yml)? As a reference, you can use the [new Translation](https://github.com/huggingface/transformers/blob/main/docs/TRANSLATING.md) guide (section "✍️ Start translating"). This would allow the tests to pass.

_The documentation is not available anymore as the PR was closed or merged._

Hi @omarespejel , I added `fast_tokenizers` to the _toctree.yml file.
There is still a `check_code_quality` check that is failing, are there further modifications on my part to perform to address this or is this ok?

Thank you very much @jloayza10! This was great. Please let me know if you would like to translate another file 🤗