Update as per @paroche's comments

Author: jchue

1-js/11-async/03-promise-chaining/article.md

@@ -287,7 +287,7 @@ fetch('/article/promise-chaining/user.json')
   });
 ```
 
-The code works; see comments about the details. However, there's a potential problem in it, a typical error of those who begin to use promises.
+The code works; see comments about the details. However, there's a potential problem in it, a typical error for those who begin to use promises.
 
 Look at the line `(*)`: how can we do something *after* the avatar has finished showing and gets removed? For instance, we'd like to show a form for editing that user or something else. As of now, there's no way.
 
@@ -321,7 +321,7 @@ fetch('/article/promise-chaining/user.json')
 
 That is, the `.then` handler in line `(*)` now returns `new Promise`, that becomes settled only after the call of `resolve(githubUser)` in `setTimeout` `(**)`. The next `.then` in the chain will wait for that.
 
-As a good practice, an asynchronous action should always return a promise. That makes it possible to plan actions after it. Even if we don't plan to extend the chain now, we may need it later.
+As a good practice, an asynchronous action should always return a promise. That makes it possible to plan actions after it; even if we don't plan to extend the chain now, we may need it later.
 
 Finally, we can split the code into reusable functions: