WIP: Google Doc and Calendar Feature

This sentence seems a little clunky, globalization-wise. Maybe:

To add a Google document XBlock in OLX, you create the ``google-document`` element. You can embed the ``google-document`` element in the ``vertical`` element, or you can create the ``google-document`` element as a stand-alone file that you reference in the vertical. 

If that's a bit repetitive, maybe:

To add a Google document XBlock in OLX, you create the ``google-document`` element. You can create this element as a stand-alone file that you reference in the vertical, or you can embed this element in the ``vertical`` element.