[i18n-KO] fix: docs: ko: sagemaker anchors and  `_toctree.yml`
Author: jungnerd
Pull request: yes

Co-authored-by: Wonhyeong Seo
<wonhseo@kakao.com>

# What does this PR do?
I fixed the anchors and `_toctree.yml`

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Part of #20179 (issue)


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Comments:
_The documentation is not available anymore as the PR was closed or merged._

<img src="https://user-images.githubusercontent.com/29195190/229707009-e1fca054-e464-4b98-af53-809e4c0778db.jpg" width="200px">

We are getting a 500 error (probably due to spacing issues in `_toctree.yml`). Please do not merge until the problem is resolved.

> I think the error in the doc preview comes from bad yaml syntax in the modified toctree.

Yes, I agree @sgugger . There were two titles for a section on L13-19. Editing `_toctree.yml` like so fixed the issue for me locally.
![image](https://user-images.githubusercontent.com/29195190/229802966-94eabdb3-0fff-4453-a2ca-caf188dee1f9.png)


Also when squashing the commits, please fix the typo on `Co-auth*e*red-by` to `Co-auth*o*red-by` and add arrow brackets (`<>`) to the email.
You may also use Github Desktop to ease the process. Thank you for your PR @jungnerd and feel free to ask me any questions.

Great work, @jungnerd !
You solved the issue; now please squash the commits into one. You can use
- chat-gpt for the commit message and 
- Github Desktop to add co-authors

if you want. :raised_hands: Good night!

@jungnerd we can remove the `_toctree.yml` change completely as we updated it in the upstream `ko: complete toctree` commit. After that and rebasing, this PR should be good to go! Let's try to do this on Thursday.

May you please review this PR?
@sgugger, @ArthurZucker, @eunseojo