minor fixes

1-js/04-object-basics/02-object-copy/article.md

@@ -186,6 +186,8 @@ let clone = Object.assign({}, user);
 
 It copies all properties of `user` into the empty object and returns it.
 
+There are also other methods of cloning an object, e.g. using the [spread operator](info:rest-parameters-spread) `clone = {...user}`, covered later in the tutorial.
+
 ## Nested cloning
 
 Until now we assumed that all properties of `user` are primitive. But properties can be references to other objects. What to do with them?