Fix typo

Author: glebmikulko

1-js/08-prototypes/04-prototype-methods/article.md

@@ -194,7 +194,7 @@ let clone = Object.create(Object.getPrototypeOf(obj), Object.getOwnPropertyDescr
 - [Object.getOwnPropertySymbols(obj)](mdn:js/Object/getOwnPropertySymbols) -- returns an array of all own symbolic keys.
 - [Object.getOwnPropertyNames(obj)](mdn:js/Object/getOwnPropertyNames) -- returns an array of all own string keys.
 - [Reflect.ownKeys(obj)](mdn:js/Reflect/ownKeys) -- returns an array of all own keys.
-- [obj.hasOwnProperty(key)](mdn:js/Object/hasOwnProperty): it returns `true` if `obj` has its own (not inherited) keytt named `key`.
+- [obj.hasOwnProperty(key)](mdn:js/Object/hasOwnProperty): it returns `true` if `obj` has its own (not inherited) key named `key`.
 
 We also made it clear that `__proto__` is a getter/setter for `[[Prototype]]` and resides in `Object.prototype`, just as other methods.