docs(mapValues): Improve return value description across all languages

[wo-o29]

Summary

This PR improves the return value description for the mapValues function across all language documentation (English, Korean, Japanese, and Simplified Chinese). The Korean documentation previously had the return value description in English, and all language versions now provide more specific descriptions that explicitly mention the getNewValue function.

Changes

• Updated Korean documentation to use Korean language for the return value description
• Enhanced all language versions to explicitly reference the getNewValue function in the return value description
• Made descriptions more specific and clear about how values are transformed

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
es-toolkit	Ready	Preview	Comment	Oct 12, 2025 10:48am

[Copilot]

Pull Request Overview

Updates documentation for the mapValues function across all language versions to improve the return value descriptions. The changes make the descriptions more specific by explicitly referencing the getNewValue function and ensure consistency between languages.

• Translated Korean documentation from English to Korean for the return value description
• Enhanced all language versions to explicitly mention the getNewValue function in return value descriptions
• Made descriptions more specific about how values are transformed

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
docs/zh_hans/reference/object/mapValues.md	Updated Chinese return value description to reference getNewValue function
docs/reference/object/mapValues.md	Enhanced English return value description with getNewValue function reference
docs/ko/reference/object/mapValues.md	Translated return value description from English to Korean and added getNewValue reference
docs/ja/reference/object/mapValues.md	Updated Japanese return value description to reference getNewValue function

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.90%. Comparing base (21bd853) to head (5393bd7).

Additional details and impacted files

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  Coverage   99.90%   99.90%           
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  Files         468      468           
  Lines        4439     4439           
  Branches     1309     1309           
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  Hits         4435     4435           
  Misses          4        4           

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