docs(@toss/utils): update example for formatToKRW to reflect correct output

[bskim45]

Overview

This pull request updates the documentation for the formatToKRW function to reflect a corrected behavior when using the ceilUnit option.

• Documentation update:
  • packages/common/utils/src/Numbers_formatToKRW.en.md: Updated the example output for formatToKRW with the ceilUnit option to reflect the corrected behavior, showing that values are now rounded up to the nearest unit.

PR Checklist

• I read and included theses actions below

1. I have read the Contributing Guide
2. I have written documents and tests, if needed.

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