Translate: <textarea> (#605)

* Translate: <textarea>

* translate <textarea> document into Korean

* fix: colon to period

* update the document after review

* Update src/content/reference/react-dom/components/textarea.md

Co-authored-by: KIM, WOOJUNG <gnujoow@users.noreply.github.com>

* Update src/content/reference/react-dom/components/textarea.md

Co-authored-by: KIM, WOOJUNG <gnujoow@users.noreply.github.com>

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Co-authored-by: Haegul Pyun <phg2491@gmail.com>
Co-authored-by: KIM, WOOJUNG <gnujoow@users.noreply.github.com>

Author: 3 people