As far as I know, and I may be wrong, but you can have the TC2 look at the .docx file on a shared drive that another computer can edit on. We've done a few small productions using this method, you even get an icon alert on the TC2 showing that the Word doc has been changed.
The only way is to update the script in a Word document. Once you hit save in Word you will see an update circle at the top of the automation window. Clicking that will update the script.
The downside is that it will also reset the script to the very beginning, which is frustrating to me, when I need to update a line near the end and then have to scroll through my entire script again to find my change.