Fix a typo

Author: K-Sato1995

1-js/09-classes/01-class/article.md

@@ -89,7 +89,7 @@ What `class User {...}` construct really does is:
     - The function code is taken from the `constructor` method (assumed empty if we don't write such method).
 3. Stores all methods, such as `sayHi`, in `User.prototype`.
 
-Afterwards, for new objects, when we call a method, it's taken from the prototype, just as  described in the chapter <info:function-prototype>. So `new User` object has access to class methods.
+Afterwards, for new objects, when we call a method, it's taken from the prototype, just as  described in the chapter <info:function-prototype>. So a `new User` object has access to class methods.
 
 We can illustrate the result of `class User` declaration as: