Added Korean translation

[KANGPUNGYUN]

Description

I translated the explanation of Aliquot Sum function into Korean.

Checklist

• [x] A description of the changes in this PR is mentioned above.
• [x] All the new and existing checks pass.
• [x] No plagiarized, duplicated, or repetitive documentation that has been directly copied from another source.
• [x] If it's a new explanation, it contains solid, understandable, and accessible information.
• [x] I have read the whole contributing guidelines and agree to the Code of Conduct.