Documentation: remove "token" from discovery docs
Documentation: remove "token" from discovery docs

It was a bit confusing how the term "token" was overriden in various ways in this doc. Clean it up by referring to it as a discovery URL.
insionng/etcd,yudai/etcd,plasticbox/etcd,gyuho/etcd,chai2010-playground/etcd,yyljlyy/etcd,nekto0n/etcd,dnaeon/etcd,crandles/etcd,mgoelzer/etcd-fork2,njharman/etcd,siddontang/etcd,dannysauer/etcd,nekto0n/etcd,njucslqq/etcd,dnaeon/etcd,olark/etcd,ecnahc515/etcd,tamird/etcd,xychu/etcd,HideoYamauchi/etcd,mickep76/etcd,insequent/etcd,sofuture/etcd,polvi/etcd,plasticbox/etcd,njucslqq/etcd,vimalk78/etcd,cockroachdb/etcd,arthurcolle/etcd,wowsoso/etcd,YuleiXiao/etcd,mqliang/etcd,msanterre/etcd,pengzj/etcd,chenbaihu/etcd,wowsoso/etcd,visheshnp/etcd,cchamplin/etcd,jravetch/etcd,endocode/etcd,fasaxc/etcd,gityf/etcd,fanminshi/etcd,spacejam/etcd,shafreeck/etcd,nieanan/etcd,delkyd/etcd,lzbgt/etcd,mkumatag/etcd,jonboulle/etcd,beni55/etcd,beni55/etcd,xebitstudios/etcd,glensc/etcd,rnaveiras/etcd,giantswarm/etcd,tangkun75/etcd,glevand/coreos--etcd,zaphod-concur/etcd,glycerine/etcd,SivagnanamCiena/etcd,heyitsanthony/etcd,imzhulei/etcd,jchauncey/etcd,bdarnell/etcd,akauppi/etcd,ajityagaty/etcd,ktateish/etcd,yichengq/etcd,kingland/etcd,jeremyeder/etcd,endocode/etcd,csuideal/etcd,whuwxl/etcd,Timer/etcd,giantswarm/etcd,rnaveiras/etcd,devfreesg/etcd,QuantiumTechnology/etcd,tguangch/etcd,mike-lerch/etcd,wantonsolutions/dinv-etcd,barakmich/etcd,iamqizhao/etcd,tguangch/etcd,es-chow/etcd,etcd-io/etcd,luxas/etcd,bakins/etcd,ravigadde/etcd,youxidev/etcd,shawnps/etcd,StorReduce/etcd,Winslett/etcd,Eagle-X/etcd,xueshanf/etcd,insequent/etcd,glensc/etcd,jonboulle/etcd,mgoelzer/etcd-fork2,kingland/etcd,westhood/etcd,hongbinz/etcd,svdata/etcd,mitake/etcd,chai2010/etcd,lumjjb/etcd,swingbach/etcd,pengzj/etcd,junxu/etcd,cchamplin/etcd,mwitkow/etcd,improbable-io/etcd,shakefu/etcd,lzbgt/etcd,njharman/etcd,xdlinear/etcd,li-ang/etcd,armstrongli/etcd,swingbach/etcd,youxidev/etcd,gosharplite/etcd,imzhulei/etcd,asim/etcd,etcd-io/etcd,fasaxc/etcd,pauldallen/etcd,sebrandon1/etcd,dalanlan/etcd,yyljlyy/etcd,handsomesun/etcd,wantonsolutions/dinv-etcd,kkaneda/etcd,honeyqa/etcd,steveeJ/etcd,jravetch/etcd,offscale/etcd,combk8s/etcd,jmptrader/etcd,hroyrh/etcd,mqliang/etcd,YuleiXiao/etcd,wfxiang08/etcd,polvi/etcd,mitake/etcd,qqsun8819/etcd,pigfoot/etcd,Yhgenomics/etcd,wantonsolutions/dinv-etcd,gyuho/etcd,yichengq/etcd,elimisteve/etcd,betawaffle/etcd,shawnps/etcd,fanminshi/etcd,justintung/etcd,hongbinz/etcd,SivagnanamCiena/etcd,xueshanf/etcd,chai2010-playground/etcd,mwitkow-io/etcd,a-robinson/etcd,jefby/etcd,hzy001/etcd,chenbaihu/etcd,insionng/etcd,jlamillan/etcd,snailwalker/etcd,oscarrr110/etcd,arthurcolle/etcd,nkhare/etcd,sayden/etcd,visheshnp/etcd,jefby/etcd,nkhare/etcd,axingblog/etcd,axingblog/etcd,jmptrader/etcd,freeloop1114/etcd,crandles/etcd,elimisteve/etcd,handsomesun/etcd,tamird/etcd,xebitstudios/etcd,gityf/etcd,improbable-io/etcd,mwitkow-io/etcd,QuantiumTechnology/etcd,wfxiang08/etcd,cognusion/etcd,westhood/etcd,asim/etcd,HideoYamauchi/etcd,mqliang/etcd,princeqjzh/etcd,Winslett/etcd,li-ang/etcd,Timer/etcd,mischief/etcd,buaazp/etcd,hzy001/etcd,OyTao/etcd_learning,linuxcer/etcd,spacejam/etcd,yifan-gu/etcd,pauldallen/etcd,raoofm/etcd,junxu/etcd,mickep76/etcd,Yhgenomics/etcd,chipironcin/etcd,shafreeck/etcd,zaphod-concur/etcd,CrazyJvm/etcd,msanterre/etcd,robszumski/etcd,glycerine/etcd,xychu/etcd,gosharplite/etcd,tempbottle/etcd,akauppi/etcd,ylong/etcd,steveeJ/etcd,siddontang/etcd,dterei/etcd,nieanan/etcd,fasaxc/etcd,StorReduce/etcd,ktateish/etcd,jlamillan/etcd,lorneli/etcd,tangkun75/etcd,openedbox/etcd,raoofm/etcd,xdlinear/etcd,jchauncey/etcd,ylong/etcd,qiaochao911/etcd,gtank/etcd,dalanlan/etcd,onlyjob/etcd,ajityagaty/etcd,gae123/etcd,sebschrader/etcd,hongchaodeng/etcd,purpleidea/etcd,lorneli/etcd,hpcloud/etcd,whuwxl/etcd,mkumatag/etcd,sinsharat/etcd,cockroachdb/etcd,gouyang/etcd,gae123/etcd,chipironcin/etcd,hpcloud/etcd,bdarnell/etcd,olark/etcd,ecnahc515/etcd,fgbreel/etcd,cognusion/etcd,rnaveiras/etcd,vimalk78/etcd,xiang90/etcd,armstrongli/etcd,honeyqa/etcd,CrazyJvm/etcd,glevand/coreos--etcd,combk8s/etcd,svdata/etcd,sebschrader/etcd,coreos/etcd,gouyang/etcd,tempbottle/etcd,oscarrr110/etcd,yifan-gu/etcd,achanda/etcd,lumjjb/etcd,mkumatag/etcd,devfreesg/etcd,fgbreel/etcd,hongchaodeng/etcd,betawaffle/etcd,achanda/etcd,TheHippo/etcd,joshix/etcd,barakmich/etcd,joshix/etcd,sebrandon1/etcd,Eagle-X/etcd,openedbox/etcd,sofuture/etcd,sinsharat/etcd,onlyjob/etcd,luxas/etcd,princeqjzh/etcd,delkyd/etcd,dterei/etcd,chai2010/etcd,OyTao/etcd_learning,gtank/etcd,bakins/etcd,linuxcer/etcd,hroyrh/etcd,bluebreezecf/etcd,heyitsanthony/etcd,mischief/etcd,qiaochao911/etcd,dannysauer/etcd,buaazp/etcd,mike-lerch/etcd,xiang90/etcd,rchicoli/etcd,es-chow/etcd,csuideal/etcd,ravigadde/etcd,mwitkow/etcd,robszumski/etcd,iamqizhao/etcd,ajityagaty/etcd,purpleidea/etcd,TheHippo/etcd,yudai/etcd,bluebreezecf/etcd,sayden/etcd,qqsun8819/etcd,bspline/etcd,freeloop1114/etcd,a-robinson/etcd,jeremyeder/etcd,coreos/etcd,kkaneda/etcd,etcd-io/etcd,shakefu/etcd,justintung/etcd,rchicoli/etcd,offscale/etcd,bspline/etcd,snailwalker/etcd