Update README.md

Author: glibnub

README.md

@@ -23,11 +23,11 @@ To run this sample:
 
 Set the environment variable `AZURE_AUTH_LOCATION` with the full path for an auth file. See [how to create an auth file](https://github.com/Azure/azure-libraries-for-java/blob/master/AUTH.md).
 
-    git clone https://github.com/Azure-Samples/managed-disk-java-convert-existing-virtual-machines-to-use-managed-disks.git
-
-    cd managed-disk-java-convert-existing-virtual-machines-to-use-managed-disks
-
-    mvn clean compile exec:java
+```bash
+git clone https://github.com/Azure-Samples/managed-disk-java-convert-existing-virtual-machines-to-use-managed-disks.git
+cd managed-disk-java-convert-existing-virtual-machines-to-use-managed-disks
+mvn clean compile exec:java
+```
 
 ## More information ##