Semanticize intermediate headings

blog_posts/javascript-sleep.md

@@ -9,7 +9,7 @@ excerpt: Learn all the different ways you can implement a sleep() function in Ja
 
 JavaScript does not come with a `sleep()` function out of the box and that is probably a good idea considering the environments where it runs and the trouble such a function could cause if used incorrectly. The closest equivalent of such a function is `setTimeout`, however there are other, less common ways to implement a function that will freeze the current thread for a specified amount of time.
 
-**setTimeout**
+### setTimeout
 
 JavaScript's `setTimeout` sets a timer which executes a function or specified piece of code once the timer expires. Only the code inside the `setTimeout` callback will execute after the timer expires, which can lead to nesting issues, as well as code executing out of order if you are not careful.
 
@@ -23,7 +23,7 @@ const printNums = () => {
 printNums(); // Logs: 1, 3, 2 (2 logs after 500ms)
 ```
 
-**Synchronous version**
+### Synchronous version
 
 While strongly discouraged, `Date.prototype.getTime()` can be used inside a `while` loop to pause execution for a set amount of time. You can easily define a synchronous `sleep()` function like this:
 
@@ -43,7 +43,7 @@ const printNums = () => {
 printNums(); // Logs: 1, 2, 3 (2 and 3 log after 500ms)
 ```
 
-**Asynchronous version**
+### Asynchronous version
 
 A less intrusive way to go about implementing a `sleep()` function is to utilize the `async` and `await` keywords added in JavaScript ES6, a `Promise` and `setTimeout()`. Note that the resulting function must be executed in an `async` function and has to be called with `await`: