[PR - Korean] Translation of Writing Guidelines and update Grammar Corrections of exist docs

[KNU-K]

PR Description

Summary of Changes

• Grammar corrections
• More natural expressions
• Adding Korean to the guidelines
• Adding guidelines link

Detailed Changes

1. Grammar Corrections

   • Corrected grammar errors in the existing document.

2. Natural Expressions

   • Updated to more natural and easily understandable expressions.

3. Adding Korean to the Guidelines

   • Added Korean translations to the guidelines to improve accessibility for Korean users.

4. Adding Guidelines Link

   • Included a link to the guidelines for easy access.

Thank you!

[KNU-K]

If there are any necessary parts missing, I'll add them. Please review. :)