Fix error

const combined = [...arr1, arr2] would result in [ 1, 2, 3, [ 4, 5, 6 ] ]

blog_posts/js-spread-operator-tricks.md

@@ -27,7 +27,7 @@ Using the spread operator, it’s possible to combine two or more arrays into on
 ```js
 const arr1 = [1, 2, 3];
 const arr2 = [4, 5, 6];
-const combined = [...arr1, arr2];
+const combined = [...arr1, ...arr2];
 // [1, 2, 3, 4, 5, 6]
 ```