🌐 [i18n-KO] Translated `package_reference/environment_variables.md` to Korean (#2311)
* docs: ko: package_reference/environment_variables.md
* feat: nmt draft
* feat: manual translate
* fix: manual edits
* fix: a minor typo
* fix: added manual translate
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Co-authored-by: Lucain <lucain@huggingface.co>