input: Write a python function to traverse a 2D list and print each row.
  assert traverse_2d_list([[1, 2], [3, 4], [5, 6]]) == None
  assert traverse_2d_list([['a', 'b'], ['c', 'd'], ['e', 'f']]) == None
  assert traverse_2d_list([[True, False], [False, True], [True, True]]) == None
output: def traverse_2d_list(lst):
      for row in lst:
          print(row)