fix: Correct typos and spacing in Korean documentation (metrics page)

[hwahyeon]

• Have you followed the contributing guidelines?
• Have you explained what your changes do, and why they add value to the Guides?

Please note: we will close your PR without comment if you do not check the boxes above and provide ALL requested information.

---

Hello,

I have made updates to the Korean documentation (/ko/metrics.md) to correct spacing and typos. These changes enhance the readability and accuracy of the document.

Changes:

• Fixed improper spacing between words and sentences.
• Corrected typos.
  • (사디 → 다시)
  • (이동하보십시오. → 이동해 보십시오.)

Please review the changes and let me know if any further adjustments are needed.

Thank you!

[Yeonheekang]

#3223

[ahpook]

Thank you for these fixes! 당신의 일에 감사드립니다