This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
then the Dispatcher Servlet really is serving up this resource right?
It looks like that line is required for the Dispatcher Servlet to be able to serve up the static content.
Yup. Sounds like you figured out the answer to your question By mapping it to / you are essentially saying that the dispatcher servlet is the default servlet and it will be handling all requests including those for static content.