docs: fix broken link for migration tool
docs: fix broken link for migration tool

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