benchmark: doc

app/src/jmh/java/de/uni_marburg/powersort/benchmark/BenchmarkJmh.java

@@ -13,6 +13,10 @@ import java.util.concurrent.TimeUnit;
 @Warmup(iterations = 3)
 @Measurement(iterations = 6)
 public class BenchmarkJmh {
+    /**
+     * Quote from JMH:
+     * State objects naturally encapsulate the state on which benchmark is working on.
+     */
     @State(Scope.Benchmark)
     public static class State1 {
         RandomIntegers d = new RandomIntegers();