Translated ```text_generation.md``` to Korean
Author: zayunsna
Pull request: yes

# What does this PR do?
Hi all!
PR : translating ```text_generation.md``` file and add creating the parent folder ```main_classes```.
Thank you for reviewing this translating results!

Part of #20179 

## Before reviewing

- [x] Check for missing / redundant translations (번역 누락/중복 검사)
- [x] Grammar Check (맞춤법 검사)
- [x] Review or Add new terms to glossary (용어 확인 및 추가)
- [x] Check Inline TOC (e.g. [[lowercased-header]])
- [x] Check live-preview for gotchas (live-preview로 정상작동 확인)
## Who can review?

As followed the guide, I would like to give a review request to @ArthurZucker, @sgugger, @eunseojo.
and also send the review request to Team PseudoLab just in case. @0525hhgus, @kihoon71, @sim-so, @gabrielwithappy, @HanNayeoniee, @wonhyeongseo.

## 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?
- [ ]  Was this discussed/approved via a Github issue or the [forum](https://discuss.huggingface.co/)? Please add a link
 to it if that's the case.
- [x]  Did you make sure to update the documentation with your changes? Here are the [documentation guidelines](https://github.com/huggingface/transformers/tree/main/docs), and [here are tips on formatting docstrings](https://github.com/huggingface/transformers/tree/main/docs#writing-source-documentation).
- [ ]  Did you write any new necessary tests?

Comments:
Hello @zayunsna , before I give a thorough review, may you please change "Fixes #20197" to "Part of #20197"?

If unchanged, it will close the issue with the merge of this PR. Thank you.


> Hello @zayunsna , before I give a thorough review, may you please change "Fixes #20197" to "Part of #20197"?
> 
> If unchanged, it will close the issue with the merge of this PR. Thank you.

It's corrected!

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.

> 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.

Still waiting for the review. I hope to get comments or further process.

> Hey! Thanks for opening the PR and continuing the translation 🔥 There was a pretty big change in the text generation documentation which does not match this one anymore. Would you mind updating ? 😓 sorry for this

No worries! 
I'll have a look at the changed item! 
I just quickly glanced at the material but it seems there needs to be a detailed comparison of what was updated.
Thank you for letting me know!
Let's keep in touch!

Dear @zayunsna 
I will review it together! 🙂
Wecl can discuss about translation on the huggingface discord 한국어 channel.
https://discord.com/channels/879548962464493619/1105153909552586812

@ArthurZucker, Hi :)  I have a look at a new update of 'transformer'.
So from now, this PR contains the updated item as same as the main repo.
I hope this is what you want!

@zayunsna 
As we dicuss, forked repo need to be synced before pusing the  PR.
And  I recommend  u to make a branch in your forked repo.
[Transformer] - [Forked Transformer] :: PR branch


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.