docs: link directly to github procfile
docs: link directly to github procfile

This is in response to https://github.com/coreos/docs/issues/822
Unfortunately because of how the doc sync works there has to be
a direct link here.

ajityagaty/etcd,xiang90/etcd,glevand/coreos--etcd,OyTao/etcd_learning,luxas/etcd,bdarnell/etcd,yudai/etcd,li-ang/etcd,hongchaodeng/etcd,rnaveiras/etcd,cockroachdb/etcd,bluebreezecf/etcd,glevand/coreos--etcd,mqliang/etcd,insequent/etcd,lorneli/etcd,visheshnp/etcd,akauppi/etcd,armstrongli/etcd,plasticbox/etcd,endocode/etcd,coreos/etcd,whuwxl/etcd,ravigadde/etcd,etcd-io/etcd,dannysauer/etcd,nekto0n/etcd,handsomesun/etcd,mkumatag/etcd,lumjjb/etcd,qqsun8819/etcd,zaphod-concur/etcd,OyTao/etcd_learning,nekto0n/etcd,yudai/etcd,tguangch/etcd,mkumatag/etcd,luxas/etcd,zaphod-concur/etcd,cockroachdb/etcd,sebrandon1/etcd,bluebreezecf/etcd,mqliang/etcd,a-robinson/etcd,dannysauer/etcd,mickep76/etcd,CrazyJvm/etcd,endocode/etcd,sinsharat/etcd,YuleiXiao/etcd,rnaveiras/etcd,joshix/etcd,rnaveiras/etcd,sebrandon1/etcd,fanminshi/etcd,jlamillan/etcd,gyuho/etcd,rchicoli/etcd,jlamillan/etcd,insequent/etcd,coreos/etcd,sinsharat/etcd,bdarnell/etcd,joshix/etcd,mkumatag/etcd,armstrongli/etcd,vimalk78/etcd,lumjjb/etcd,ravigadde/etcd,a-robinson/etcd,hongchaodeng/etcd,xiang90/etcd,tguangch/etcd,CrazyJvm/etcd,qqsun8819/etcd,heyitsanthony/etcd,mqliang/etcd,lorneli/etcd,handsomesun/etcd,vimalk78/etcd,li-ang/etcd,YuleiXiao/etcd,rchicoli/etcd,heyitsanthony/etcd,akauppi/etcd,etcd-io/etcd,whuwxl/etcd,ajityagaty/etcd,plasticbox/etcd,visheshnp/etcd,gyuho/etcd,etcd-io/etcd,ajityagaty/etcd,mickep76/etcd,fanminshi/etcd