Update Leetcode 题解.md

docs/notes/Leetcode 题解.md

@@ -2317,9 +2317,7 @@ public void solveSudoku(char[][] board) {
         }
 
     for (int i = 0; i < 9; i++) {
-        for (int j = 0; j < 9; j++) {
-            backtracking(i, j);
-        }
+        backtracking(i, 0);
     }
 }