raft: small typo fixes in raft package doc
raft: small typo fixes in raft package doc

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