Update article.md

Author: leviding

1-js/12-generators-iterators/2-async-iterators-generators/article.md

@@ -363,7 +363,7 @@ More explanations about how it works:
     - The initial URL is `https://api.github.com/repos/<repo>/commits`, and the next page will be in the `Link` header of the response.
     - The `fetch` method allows us to supply authorization and other headers if needed -- here GitHub requires `User-Agent`.
 2. The commits are returned in JSON format.
-3. We should get the next page URL from the `Link` header of the response. It has a special format, so we use a regular expression for that (we will lern this feature in [Regular expressions](info:regular-expressions)).
+3. We should get the next page URL from the `Link` header of the response. It has a special format, so we use a regular expression for that (we will learn this feature in [Regular expressions](info:regular-expressions)).
     - The next page URL may look like `https://api.github.com/repositories/93253246/commits?page=2`. It's generated by GitHub itself.
 4. Then we yield the received commits one by one, and when they finish, the next `while(url)` iteration will trigger, making one more request.