Updated Hadoop Benchmark (markdown)

Hadoop-Benchmark.md

@@ -33,6 +33,7 @@ wget https://oss.sonatype.org/service/local/repositories/releases/content/com/gi
 
 The TestDFSIO benchmark is used for measuring I/O (read/write) performance.
 
+## TestDFSIO write tests
 Start the TestDFSIO write tests:
 
 ```
@@ -93,6 +94,8 @@ bin/hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.10.0
 20/07/14 18:27:34 INFO fs.TestDFSIO:
 ```
 
+## TestDFSIO read tests
+
 Start the TestDFSIO read tests:
 
 ```