fixed: fixed error in linked list README.ko-KR (trekhleb#820)

Co-authored-by: Oleksii Trekhleb <trehleb@gmail.com>

Author: YumYumNyang

src/data-structures/linked-list/README.ko-KR.md

@@ -137,7 +137,7 @@ end ReverseTraversal
 
 |  접근   |  탐색   |  삽입   |  삭제   |
 | :---: | :---: | :---: | :---: |
-| O(n)  | O(n)  | O(1)  | O(1)  |
+| O(n)  | O(n)  | O(1)  | O(n)  |
 
 ### 공간 복잡도