Fixed bug with shared dev notes chunk

When using "chunks" the entire page is broken when viewed on GitHub.  I swapped out this line:

```
<div chunk="../../Shared/Chunks/create-account-and-websites-note.md" >
```

With:

```
<div class="dev-callout">
<strong>Note</strong>
<p>To complete this tutorial, you need a Windows Azure account. You can create a free trial account in just a couple of minutes. For details, see <a href="http://www.windowsazure.com/en-us/pricing/free-trial/" target="_blank">Windows Azure Free Trial</a>.</p>
</div> 
```

I'm not sure why the diff shows the entire page was changed.