docs: updates StickyBalancer godoc
@@ -643,7 +643,7 @@ func (*rangeBalancer) Balance(b *ConsumerBalancer, topics map[string]int32) Into
// StickyBalancer returns a group balancer that ensures minimal partition
// movement on group changes while also ensuring optimal balancing.
//
-// Suppose there are three members M0, M1, and M3, and two topics t0 and t1
+// Suppose there are three members M0, M1, and M2, and two topics t0 and t1
// each with three partitions p0, p1, and p2. If the initial balance plan looks
// like
//
