The demo addon tutorial not consistent and contains a broken link
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XF generated Setup.php with "class Setup extends AbstractSetup" while the tutorial changes it to "class Setup extends XF\Addon\AbstractSetup" with no explanation on why this was changed. Which is correct?

Let's build an add-on | XenForo
For some people, getting stuck straight into a project is the best way to learn, and the aim is that in the following sections you will learn how to build an add-on, from scratch. Be prepared; this isn't a simple 'Hello world' type demo. This is actually a fairly full featured demo add-on which...
XF generated Setup.php with "class Setup extends AbstractSetup" while the tutorial changes it to "class Setup extends XF\Addon\AbstractSetup" with no explanation on why this was changed. Which is correct?
