Make example use an array and a for loop

Author: Esteban Echeverry

_includes/example.rs

@@ -1,7 +1,8 @@
 // This code is editable and runnable!
 fn main() {
-    println!("Hello");
-    println!("Hola");
-    println!("こんにちは");
-    println!("您好");
+    let greetings = ["Hello", "Hola", "こんにちは", "您好"];
+
+    for greeting in greetings.iter() {
+      println!("{}", greeting);
+    }
 }