I believe that is true, high elves and dark elves make good mages if you want to go the elven road. Erudites make good mages too. Basically, you want the race to have high natural intelligence since this is a mage's primary stat, which wood elves don't. However, if you want a wood elf mage, make one! It shouldn't hurt you too much, you'll just have to try to make up the intelligence in gear, and besides, you have to play the character, so make sure you'll enjoy it. Good luck to you and have fun :)
Ilena
63 Enchanter
Veeshan
Joules
8 Mage/7 Artisan of Qeynos
Guk