minor fixes

1-js/11-async/08-async-await/article.md

@@ -139,9 +139,8 @@ But we can wrap it into an anonymous async function, like this:
   ...
 })();
 ```
-
-
 ````
+
 ````smart header="`await` accepts \"thenables\""
 Like `promise.then`, `await` allows us to use thenable objects (those with a callable `then` method). The idea is that a third-party object may not be a promise, but promise-compatible: if it supports `.then`, that's enough to use it with `await`.