input: Write a function called print_doubled_numbers that prints out every number from 0 to 10, but with every number being multiplied by 2.
  assert print_doubled_numbers()
  The function should output:
  0
  2
  4
  6
  8
  10
  12
  14
  16
  18
  20
output: for i in range(11):
      print(i * 2)