[benchmark] Fix copy-paste labels in micro-benchmarks (#8521)

Author: thswlsqls

paimon-benchmark/paimon-micro-benchmarks/src/test/java/org/apache/paimon/benchmark/arrow/ArrowWriteBenchmark.java

@@ -36,7 +36,7 @@ public class ArrowWriteBenchmark {
     public void testWrite() {
         int batch = 1024 * 20;
         Benchmark benchmark =
-                new Benchmark("read", batch * batch)
+                new Benchmark("write", batch * batch)
                         .setNumWarmupIters(1)
                         .setOutputPerIteration(true);
         RowType rowType =

paimon-benchmark/paimon-micro-benchmarks/src/test/java/org/apache/paimon/benchmark/lookup/LookupReaderBenchmark.java

@@ -42,7 +42,7 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 
-/** Benchmark for measuring the throughput of writing for lookup. */
+/** Benchmark for measuring the throughput of reading for lookup. */
 @ExtendWith(ParameterizedTestExtension.class)
 public class LookupReaderBenchmark extends AbstractLookupBenchmark {
     private static final int QUERY_KEY_COUNT = 10000;