This exercise shows how to modify each element in a list. It is useful to do so in a function as you can easily put in a list of any length and get the same functionality. As you can see,
len(n) is the length of the list.
Create a function called
double_list that takes a single argument
x (which will be a list) and multiplies each element by 2 and returns that list. Use the existing code as a scaffold.