doc: add lease section to interacting doc
doc: add lease section to interacting doc

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