[DOC beta] Fix documentation to use "serializedHasManyName"
[DOC beta] Fix documentation to use "serializedHasManyName"

The variable was declared but never used in the documentation

nickiaconis/data,arenoir/data,Turbo87/ember-data,danmcclain/data,davidpett/data,HeroicEric/data,courajs/data,Eric-Guo/data,swarmbox/data,Turbo87/ember-data,vikram7/data,jgwhite/data,rtablada/data,rtablada/data,eriktrom/data,vikram7/data,wecc/data,Eric-Guo/data,davidpett/data,wecc/data,vikram7/data,topaxi/data,HeroicEric/data,tarzan/data,arenoir/data,Eric-Guo/data,vikram7/data,danmcclain/data,jgwhite/data,Turbo87/ember-data,swarmbox/data,ryanpatrickcook/data,rtablada/data,topaxi/data,workmanw/data,HeroicEric/data,workmanw/data,arenoir/data,davidpett/data,swarmbox/data,workmanw/data,workmanw/data,topaxi/data,danmcclain/data,Eric-Guo/data,courajs/data,wecc/data,swarmbox/data,eriktrom/data,davidpett/data,jgwhite/data,ryanpatrickcook/data,eriktrom/data,nickiaconis/data,HeroicEric/data,tarzan/data,courajs/data,eriktrom/data,Turbo87/ember-data,arenoir/data,tarzan/data,danmcclain/data,ryanpatrickcook/data,wecc/data,nickiaconis/data,ryanpatrickcook/data,tarzan/data,jgwhite/data,nickiaconis/data,rtablada/data,topaxi/data,courajs/data