doc: add a link to the peer url section in other_apis.go
doc: add a link to the peer url section in other_apis.go

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