Added expected output for methods unshift and push

Array methods example for unshift and push doesn't show expected output which is helpful for someone to see exactly what happens to the array and reinforces the descriptions of these methods

Author: TomHodson91

js/lesson2/tutorial.md

@@ -310,7 +310,9 @@ var animals = ['dog', 'cat', 'rabbit', 'horse', 'elephant', 'monkey'];
 animals.unshift('cow');
 animals.push('zebra');
 
-console.log(animals);
+console.log(animals); 
+
+// Expected output: ['cow', 'dog', 'cat', 'rabbit', 'horse', 'elephant', 'monkey', 'zebra']
 ```
 
 #### Removing objects