Documentation: remove v2 snapshot migration doc
Documentation: remove v2 snapshot migration doc

linuxcer/etcd,dnaeon/etcd,qqsun8819/etcd,rchicoli/etcd,lumjjb/etcd,whuwxl/etcd,zaphod-concur/etcd,plasticbox/etcd,dannysauer/etcd,mqliang/etcd,lorneli/etcd,CrazyJvm/etcd,gyuho/etcd,heyitsanthony/etcd,tguangch/etcd,glevand/coreos--etcd,mqliang/etcd,rnaveiras/etcd,cockroachdb/etcd,mqliang/etcd,gyuho/etcd,westhood/etcd,heyitsanthony/etcd,luxas/etcd,glycerine/etcd,insequent/etcd,wantonsolutions/dinv-etcd,jonboulle/etcd,chipironcin/etcd,lorneli/etcd,ktateish/etcd,YuleiXiao/etcd,endocode/etcd,CrazyJvm/etcd,StorReduce/etcd,YuleiXiao/etcd,lumjjb/etcd,ajityagaty/etcd,dnaeon/etcd,glycerine/etcd,rchicoli/etcd,handsomesun/etcd,joshix/etcd,linuxcer/etcd,armstrongli/etcd,bluebreezecf/etcd,jonboulle/etcd,hongchaodeng/etcd,mkumatag/etcd,a-robinson/etcd,nekto0n/etcd,mickep76/etcd,rnaveiras/etcd,fanminshi/etcd,etcd-io/etcd,yudai/etcd,visheshnp/etcd,ravigadde/etcd,bluebreezecf/etcd,rnaveiras/etcd,cockroachdb/etcd,dannysauer/etcd,whuwxl/etcd,chipironcin/etcd,achanda/etcd,coreos/etcd,insequent/etcd,mkumatag/etcd,mickep76/etcd,ravigadde/etcd,sebrandon1/etcd,glevand/coreos--etcd,ktateish/etcd,joshix/etcd,sofuture/etcd,plasticbox/etcd,nekto0n/etcd,purpleidea/etcd,ajityagaty/etcd,bdarnell/etcd,sinsharat/etcd,purpleidea/etcd,jlamillan/etcd,qqsun8819/etcd,achanda/etcd,mkumatag/etcd,handsomesun/etcd,li-ang/etcd,StorReduce/etcd,swingbach/etcd,xiang90/etcd,yudai/etcd,jlamillan/etcd,akauppi/etcd,akauppi/etcd,luxas/etcd,ajityagaty/etcd,bdarnell/etcd,armstrongli/etcd,visheshnp/etcd,swingbach/etcd,westhood/etcd,tguangch/etcd,coreos/etcd,fanminshi/etcd,xiang90/etcd,sofuture/etcd,OyTao/etcd_learning,wantonsolutions/dinv-etcd,sebrandon1/etcd,zaphod-concur/etcd,li-ang/etcd,hongchaodeng/etcd,vimalk78/etcd,wantonsolutions/dinv-etcd,a-robinson/etcd,vimalk78/etcd,etcd-io/etcd,sinsharat/etcd,etcd-io/etcd,endocode/etcd,OyTao/etcd_learning