Align urls in codeblock to the right

[marcofranssen]

```go main.go https://play.golang.org/p/qBTbYiZezKB playground
package main

import "fmt"

func main() {
     deferExample()
     fmt.Println("Returned from deferExample.")
}

func deferExample() {
     defer fmt.Println("Deferred log.")
     fmt.Println("Print line.")
}