Merge pull request #1421 from paroche/patch-51

Update article.md

Author: iliakan

1-js/09-classes/06-instanceof/article.md

@@ -105,7 +105,7 @@ Here's the illustration of what `rabbit instanceof Animal` compares with `Animal
 
 By the way, there's also a method [objA.isPrototypeOf(objB)](mdn:js/object/isPrototypeOf), that returns `true` if `objA` is somewhere in the chain of prototypes for `objB`. So the test of `obj instanceof Class` can be rephrased as `Class.prototype.isPrototypeOf(obj)`.
 
-That's funny, but the `Class` constructor itself does not participate in the check! Only the chain of prototypes and `Class.prototype` matters.
+It's funny, but the `Class` constructor itself does not participate in the check! Only the chain of prototypes and `Class.prototype` matters.
 
 That can lead to interesting consequences when `prototype` property is changed after the object is created.