Merge pull request #1359 from paroche/patch-43

Update article.md

Author: iliakan

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

@@ -82,7 +82,7 @@ Why was `__proto__` replaced by the functions `getPrototypeOf/setPrototypeOf`? T
 ```warn header="Don't change `[[Prototype]]` on existing objects if speed matters"
 Technically, we can get/set `[[Prototype]]` at any time. But usually we only set it once at the object creation time, and then do not modify: `rabbit` inherits from `animal`, and that is not going to change.
 
-And JavaScript engines are highly optimized to that. Changing a prototype "on-the-fly" with `Object.setPrototypeOf` or `obj.__proto__=` is a very slow operation, it breaks internal optimizations for object property access operations. So avoid it unless you know what you're doing, or JavaScript speed totally doesn't matter for you.
+And JavaScript engines are highly optimized for this. Changing a prototype "on-the-fly" with `Object.setPrototypeOf` or `obj.__proto__=` is a very slow operation, it breaks internal optimizations for object property access operations. So avoid it unless you know what you're doing, or JavaScript speed totally doesn't matter for you.
 ```
 
 ## "Very plain" objects [#very-plain]