Update nav.ts
Update nav.ts

Fixing 404 error thrown by bug on NavController documentation reference (URL is now http://ionicframework.com/docs/v2/api/navigation/NavController/).
manucorporat/ionic,alan-agius4/ionic,alan-agius4/ionic,AbraaoAlves/ionic,AbraaoAlves/ionic,jhlee8804/ionic,cambronjay/ionic,jhlee8804/ionic,joshesp/ionic,jhlee8804/ionic,alan-agius4/ionic,AbraaoAlves/ionic,AbraaoAlves/ionic,TillaTheHun0/ionic,cambronjay/ionic,dennybiasiolli/ionic,driftyco/ionic,driftyco/ionic,jhlee8804/ionic,manucorporat/ionic,dennybiasiolli/ionic,cambronjay/ionic,brianespinosa/ionic2-sass,manucorporat/ionic,joshesp/ionic,manucorporat/ionic,TillaTheHun0/ionic,dennybiasiolli/ionic,joshesp/ionic,dennybiasiolli/ionic,driftyco/ionic,jhlee8804/ionic,TillaTheHun0/ionic,alan-agius4/ionic,driftyco/ionic,cambronjay/ionic,AbraaoAlves/ionic,alan-agius4/ionic,cambronjay/ionic,manucorporat/ionic,driftyco/ionic,dennybiasiolli/ionic,TillaTheHun0/ionic,alan-agius4/ionic,joshesp/ionic