🌐 [i18n-KO] Translated `tasks/image_captioning.mdx` to Korean

[sim-so]

What does this PR do?

Translated the tasks/image_captioning.mdx file of the documentation to Korean. Thank you in advance for your review!

• [x] 이미지 캡셔닝 Image captioning
  • [x] 포켓몬 BLIP 데이터셋 가져오기 Load the Pokémon BLIP captions dataset
  • [x] 데이터셋 전처리 Preprocess the dataset
  • [x] 기본 모델 가져오기 Load a base model
  • [x] 평가 Evaluate
  • [x] 학습! Train!
  • [x] 추론 Inference

Part of https://github.com/huggingface/transformers/issues/20179

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, Pull Request section?
• [ ] Was this discussed/approved via a Github issue or the forum? 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, and here are tips on formatting docstrings.
• [ ] Did you write any new necessary tests?

Who can review?

This is a work on progress. Could you review this PR when I finish this work? @0525hhgus, @KIHOON71, @sim-so, @gabrielwithappy, @HanNayeoniee, @wonhyeongseo, @jungnerd

[HuggingFaceDocBuilderDev]

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

[sim-so]

I quickly done it! 😅 Would you review this PR?

[gabrielwithappy]

LGTM! 🤗

[sim-so]

Happy Wednesday! Could you review this PR? 😃 @sgugger, @ArthurZucker, @eunseojo