rafthttp: fix comment in msgappv2
rafthttp: fix comment in msgappv2

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