Guide: match

I think that this example culd be simpler if you used an enum of directions, instead of an ordering.
```{rust}
enum Directions {East, South, West North}
let direction = East;
match direction {
    East => println!("The direction is East"),
    South => println!("The direction is South"),
    West => println!("The direction is West"),
    North => println!(The direction is North"),
}
```
 Then the reader would not have to worry about the meaning of the method named cmp and why you have to take a reference to `y`. The second example could be
```{rust}
enum Directions {East, South, West North}
let direction = East;
let name = match direction {
    East => "East",
    South => "South",
    West => "West",
    North => "North",
}
println!("The direction is {}", name),
```