Update article.md

Author: Violet-Bora-Lee

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

@@ -138,7 +138,7 @@ new Promise(function(resolve, reject) {
 });
 ```
 
-Here the first `.then` shows `1` returns `new Promise(…)` in the line `(*)`. After one second it resolves, and the result (the argument of `resolve`, here it's `result*2`) is passed on to handler of the second `.then` in the line `(**)`. It shows `2` and does the same thing.
+Here the first `.then` shows `1` and returns `new Promise(…)` in the line `(*)`. After one second it resolves, and the result (the argument of `resolve`, here it's `result*2`) is passed on to handler of the second `.then` in the line `(**)`. It shows `2` and does the same thing.
 
 So the output is again 1 -> 2 -> 4, but now with 1 second delay between `alert` calls.