Update chain-async-functions.md

Improved example and formatting

snippets/chain-async-functions.md

@@ -3,13 +3,12 @@
 Loop through an array of functions containing asynchronous events, calling `next` when each asynchronous event has completed.
 
 ```js
-const chainAsync = fns => {
+const chainAsync = fns => { let curr = 0; const next = () => fns[curr++](next); next(); }
-	let curr = 0; const next = () => fns[curr++](next); next()
+/* 
-}
 chainAsync([
-	next => { console.log('This happens at 0 seconds'); setTimeout(next, 1000) },
+  next => { console.log('0 seconds'); setTimeout(next, 1000); },
-	next => { console.log('This happens at 1 second'); setTimeout(next, 1000) },
+  next => { console.log('1 second');  setTimeout(next, 1000); },
-	next => { console.log('This happens at 2 seconds'); setTimeout(next, 1000) },
+  next => { console.log('2 seconds');}
-	next => { console.log('Done at 3 seconds!') }
 ])
+*/
 ```