update korean docs in docs/ko/

[baadaa]

Description

Update the two .md files in docs/ko/ for Korean. There were some missing sections in translation as well as an outdated part.

Issue fixed

Match the current base docs (i.e. English writings) in Korean translation.

Type of changes

• ⚪ Bug fix (Change that fixed an issue)
• ⚪ Breaking change (Change that can cause existing functionality to change)
• ⚪ Improvement (Change that improves the code. Maybe performance or development improvement)
• ⚪ Feature (Change that adds new functionality)
• 🔘 Documentation change (Change that modifies documentation. Maybe typo fixes)

Checklist:

• 🔘 My code follows the project code style
• ⚪ I have written test for my code and it has been tested
• ⚪ All existing tests have been passed
• ⚪ I have attached a screenshot/video to visualize my change if possible

[Rokt33r]

기여 감사합니다!