Tiny improvement for doc
Author: fzyzcjy
Pull request: yes

# What does this PR do?

Hi, thanks for the toolkit! Here is a tiny improvement to the doc - originally the doc renders as

> Calling save_pretrained() will automatically call save_pretrained()

so it may not be super clear to readers before they click the two links and examine.

![image](https://github.com/huggingface/transformers/assets/5236035/81ae3972-06f4-43e7-9a76-772aacfc9590)


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Fixes # (issue)


## Before submitting
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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_29581). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.