Update API docs for 2.2.0.
Update API docs for 2.2.0.

kpfefferle/website,SaladFork/emberjs-website,kpfefferle/website,zeppelin/emberjs-website,Eric-Guo/website,AaronSikes/website,workmanw/ember-website,josemarluedke/ember-website,bmac/website,SaladFork/emberjs-website,workmanw/ember-website,josemarluedke/ember-website,Eric-Guo/website,bmac/website,workmanw/ember-website,zeppelin/emberjs-website,kpfefferle/website,josemarluedke/ember-website,bmac/website,bmac/website,AaronSikes/website,zeppelin/emberjs-website,SaladFork/emberjs-website,SaladFork/emberjs-website,AaronSikes/website,workmanw/ember-website,josemarluedke/ember-website,Eric-Guo/website,zeppelin/emberjs-website