[ Docs] translated peft (ES) and toctree.yml add
Author: njackman-2344
Pull request: yes

Add the Spanish version of `peft.md` to `transformers/docs/source/es` 

#28936

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Comments:
> Hi @njackman-2344, I appreciate you asking me to review again. However, I still have some concerns about the fluency and coherence of the translation. Would you mind taking another look at all the comments made [here](https://github.com/huggingface/transformers/pull/30554/commits/03a1a7d2c0b00ecfde6f4b9c3c19b68ae341b5d7) and addressing those issues? I think it would really make a big difference. Additionally, I wanted to suggest you to use tools like [HuggingChat](https://huggingface.co/chat/) to assist you in the translations and improving their fluency and coherence. Once you've made the necessary changes, I'll be happy to review again.

Ok! Thank you! I didn't see the corrections. I will do that.

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