raft: Fix comment on sendHeartbeat
@@ -529,7 +529,7 @@ func (r *raft) maybeSendAppend(to uint64, sendIfEmpty bool) bool {
return true
}
-// sendHeartbeat sends an empty MsgApp
+// sendHeartbeat sends a heartbeat RPC to the given peer.
func (r *raft) sendHeartbeat(to uint64, ctx []byte) {
// Attach the commit as min(to.matched, r.committed).
// When the leader sends out heartbeat message,
