Hello ebaynut31,
I can't find the exact message that you are looking for, but I do have some information to share with you since I am also doing a Discovery Magic Plan for my upcoming trip.
Regarding the spa, you can choose to have it a Grand Floradian (cost you 1 wish per person, each treatment is about 25 min long), or at Disney Institute (2 wishes per person, about 50 min long).
I have heard that the treatments are better at DI then at GF. I have a copy of list of spa treatments offered at DI. If you are interested, send me an email.