fix(raft_stats): spelling followers not follwers
fix(raft_stats): spelling followers not follwers

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cd,siddontang/etcd,jmptrader/etcd,fasaxc/etcd,TheHippo/etcd,Yhgenomics/etcd,visheshnp/etcd,yudai/etcd,steveeJ/etcd,lumjjb/etcd,polvi/etcd