message: Improve datalink interfaces example
diff: @@ -327,8 +327,7 @@ impl ::std::fmt::Display for NetworkInterface {
  /// // up, not loopback and has an IP.
  /// let default_interface = all_interfaces
  /// .iter()
  -/// .filter(|e| e.is_up() && !e.is_loopback() && e.ips.len() > 0)
  -/// .next();
  +/// .find(|e| e.is_up() && !e.is_loopback() && !e.ips.is_empty();
  ///
  /// match default_interface {
  /// Some(interface) => println!("Found default interface with [{}].", interface.name),
  