Merge pull request #1795 from zhang1pr/master

Fix typos

Author: iliakan

1-js/09-classes/02-class-inheritance/article.md

@@ -438,7 +438,7 @@ It works as intended, due to `[[HomeObject]]` mechanics. A method, such as `long
 
 As we've known before, generally functions are "free", not bound to objects in JavaScript. So they can be copied between objects and called with another `this`.
 
-The very existance of `[[HomeObject]]` violates that principle, because methods remember their objects. `[[HomeObject]]` can't be changed, so this bond is forever.
+The very existence of `[[HomeObject]]` violates that principle, because methods remember their objects. `[[HomeObject]]` can't be changed, so this bond is forever.
 
 The only place in the language where `[[HomeObject]]` is used -- is `super`. So, if a method does not use `super`, then we can still consider it free and copy between objects. But with `super` things may go wrong.
 
@@ -478,7 +478,7 @@ tree.sayHi();  // I'm an animal (?!?)
 */!*
 ```
 
-A call to `tree.sayHi()` shows "I'm an animal". Definitevely wrong.
+A call to `tree.sayHi()` shows "I'm an animal". Definitely wrong.
 
 The reason is simple:
 - In the line `(*)`, the method `tree.sayHi` was copied from `rabbit`. Maybe we just wanted to avoid code duplication?