Add SHA to fix GitHub links in API docs.
Add SHA to fix GitHub links in API docs.

Closes https://github.com/emberjs/website/issues/1988.

bmac/website,cllns/emberjs-website,cyberkoi/website,maxcal/website,EricSchank/website,ktornwall/website,cyberkoi/website,mrjavascript/website,martndemus/website,SaladFork/emberjs-website,AaronSikes/website,josemarluedke/ember-website,balupton/ember-website,SaladFork/emberjs-website,quangv/website,AgilionApps/website,mrjavascript/website,raycohen/website,elidupuis/website,kpfefferle/website,SaladFork/emberjs-website,Eric-Guo/website,koriroys/emberjs-website,quangv/website,duggiefresh/website,Eric-Guo/website,AgilionApps/website,workmanw/ember-website,greyhwndz/website,AaronSikes/website,cyberkoi/website,bmac/website,MinxianLi/ember,davidpett/website,shearwater-intl/website,tmock12/website,greyhwndz/website,AgilionApps/website,jimmay5469/website,greyhwndz/website,josemarluedke/ember-website,mrjavascript/website,ktornwall/website,elwayman02/website,wifelette/website,martndemus/website,zeppelin/emberjs-website,kpfefferle/website,MinxianLi/ember,balupton/ember-website,workmanw/ember-website,josemarluedke/ember-website,balupton/ember-website,cllns/emberjs-website,martndemus/website,AaronSikes/website,elwayman02/website,wifelette/website,datajohnny/website,jimmay5469/website,maxcal/website,ktornwall/website,EricSchank/website,elidupuis/website,tmock12/website,elidupuis/website,josemarluedke/ember-website,cllns/emberjs-website,shearwater-intl/website,datajohnny/website,bmac/website,kpfefferle/website,quangv/website,jimmay5469/website,workmanw/ember-website,wifelette/website,Eric-Guo/website,kkenan/website,zeppelin/emberjs-website,bmac/website,kkenan/website,elwayman02/website,raycohen/website,SaladFork/emberjs-website,zeppelin/emberjs-website,kkenan/website,davidpett/website,raycohen/website,datajohnny/website,MinxianLi/ember,duggiefresh/website,workmanw/ember-website,koriroys/emberjs-website,maxcal/website,shearwater-intl/website,koriroys/emberjs-website,zeppelin/emberjs-website,duggiefresh/website,EricSchank/website,davidpett/website,tmock12/website