Hi Deborah Ivan,
I took a look at the document and there were other links broken as well, sorry about that. But thank you for alerting us to it! This can happen if the linked content was moved or updated. However, you should be all set, I went through each link to make sure they are all current!
Also, as sabina27 suggested, you can type the @ symbol, then begin typing the name of the doc or search for the title in the search box if this happens again.
Thanks again!