Update NatashasHelpfulLinks.md

Author: Natasha Rooney

NatashasHelpfulLinks.md

@@ -2,23 +2,23 @@ When building for ServiceWorker I use a bunch of links to help me get started an
 
 Super Tip: If you're building ServiceWorkers use a beta verison of a browser (e.g. [Chrome Canary](https://www.google.co.uk/intl/en/chrome/browser/canary.html) or [Firefox Nightly](http://nightly.mozilla.org/)).
 
-## Tutorials and Implementations
+### Tutorials and Implementations
 
 * [Is Service Worker Ready Yet](https://jakearchibald.github.io/isserviceworkerready/) - Jake Archibald made a great website which details ServiceWorker implementations across the major browsers.
 * [ServiceWorkers and Firefox](https://hacks.mozilla.org/2014/06/serviceworkers-and-firefox/) - Introduction to ServiceWorkers on Firefox!
 * [Service Worker - first draft published](http://jakearchibald.com/2014/service-worker-first-draft/) - Introduction and tutorial including code snippets!
 * [Video: The ServiceWorker: The network layer is yours to own](https://www.youtube.com/watch?v=4uQMl7mFB6g) - video introducing ServiceWorker including HTTP caching, request, and showing SW in forms, the basis for push messaging, alarms, geofencing and background sync.
 
-## Debugging
+### Debugging
 
 * ServiceWorkerInternals (chrome canary only - chrome://serviceworker-internals/) - page for debugging ServiceWorkers in chrome, including stopping, unregistering and starting workers.
 
-## Examples
+### Examples
 
 * [Jake Archibald's Trained to Thrill](https://jakearchibald.github.io/trained-to-thrill/) - Jake made a great demo app which pulls in images from Flickr, uses fetch, uses cache (not implemented yet) and worker registrations.
 * [Simple ServiceWorker](https://github.com/matthew-andrews/serviceworker-simple) - A simple Service Worker example by Matt Andrews.
 
-## Other APIs
+### Other APIs
 
 * [Promises HTML5Rocks](http://www.html5rocks.com/en/tutorials/es6/promises/) - Understanding Promises (used frequently in ServiceWorkers especially in fetch, cache). 
 * [The Basics of Web Workers](http://www.html5rocks.com/en/tutorials/workers/basics/) - Understanding concurrency in JavaScript and how web workers work.