Fix error in REST adapter documentation
Fix error in REST adapter documentation

The property to change host is `host` not `url`.
maxcal/website,wifelette/website,MinxianLi/ember,shearwater-intl/website,duggiefresh/website,balupton/ember-website,kpfefferle/website,EricSchank/website,martndemus/website,kkenan/website,cllns/emberjs-website,praxxis/website,rwjblue/website,elwayman02/website,greyhwndz/website,mrjavascript/website,zeppelin/emberjs-website,duggiefresh/website,wifelette/website,SaladFork/emberjs-website,quangv/website,AaronSikes/website,SaladFork/emberjs-website,maczniak/emberjs,ktornwall/website,tmock12/website,davidpett/website,zeppelin/emberjs-website,greyhwndz/website,praxxis/website,koriroys/emberjs-website,raycohen/website,bmac/website,raycohen/website,zeppelin/emberjs-website,wifelette/website,workmanw/ember-website,jimmay5469/website,balupton/ember-website,quangv/website,kkenan/website,knownasilya/website,maxcal/website,elidupuis/website,AgilionApps/website,kkenan/website,workmanw/ember-website,shearwater-intl/website,greyhwndz/website,shearwater-intl/website,MinxianLi/ember,balupton/ember-website,cyberkoi/website,koriroys/emberjs-website,josemarluedke/ember-website,maczniak/emberjs,elidupuis/website,SaladFork/emberjs-website,rwjblue/website,ktornwall/website,knownasilya/website,AgilionApps/website,Nick-Cotter/aboutme,datajohnny/website,cyberkoi/website,Nick-Cotter/aboutme,cllns/emberjs-website,raycohen/website,kpfefferle/website,tmock12/website,cyberkoi/website,davidpett/website,maxcal/website,martndemus/website,shama/website,datajohnny/website,duggiefresh/website,josemarluedke/ember-website,jimmay5469/website,elwayman02/website,cllns/emberjs-website,bmac/website,josemarluedke/ember-website,mrjavascript/website,AaronSikes/website,davidpett/website,tmock12/website,datajohnny/website,Eric-Guo/website,quangv/website,EricSchank/website,bmac/website,Eric-Guo/website,bmac/website,koriroys/emberjs-website,kpfefferle/website,shama/website,josemarluedke/ember-website,SaladFork/emberjs-website,mrjavascript/website,workmanw/ember-website,AgilionApps/website,martndemus/website,MinxianLi/ember,workmanw/ember-website,elidupuis/website,elwayman02/website,zeppelin/emberjs-website,EricSchank/website,jimmay5469/website,ktornwall/website,AaronSikes/website,Eric-Guo/website