feat(kept-promise): improve subject

subjects/devops/kept-promise/README.md

@@ -2,22 +2,20 @@
 
 ### Instructions
 
-Thing in your code does not always happen as fast as you would like.
+Things in your code do not always happen as fast as you would like.
 
-Sometimes it is important to wait for a function to finish before keep going on.
+Sometimes it is important to wait for a function to finish before keep going on. Other times you don't want your code to be blocking while waiting.
 
 Create an asynchronous function `processInfo` in a file `kept-promise.js`. The function `processInfo` will take an asynchronous function as an input, and it will print the message `Ok!` if the return of the input function is zero or a multiple of two, `Error!` otherwise.
 
 The following function can be used as an example of input function for `processInfo`:
 
 ```js
-const getImportantInfo = _ =>
-  new Promise(resolve => {
-    setTimeout(() => resolve(Math.round(Math.random() * 10)), 1000)
-  })
+const getImportantInfo = async _ =>
+  new Promise(resolve => resolve(Math.round(Math.random() * 10)))
 ```
 
-> Assume that your function will always get a valid input function 
+> Assume that your function will always get a valid input function
 
 ### Example
 
@@ -46,7 +44,13 @@ Ok!
 $
 ```
 
+### Hints
+
+- It is possible to wait for an asynchronous function with the keyword `await`. Alternatively, it can be clearer to use the method `.then`.
+
 ### Notions
 
+- [Introducing asynchronous JavaScript](https://developer.mozilla.org/en-US/docs/Learn/JavaScript/Asynchronous/Introducing)
+- [await](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/await)
 - [Using promises](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Using_promises)
 - [async function](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function)