HDDS-483. Update ozone Documentation to fix below issues.

Contributed by  Namit Maheshwari.

(cherry picked from commit 48319d6eee6ecea9992f3959ed75c892aa09f66c)

hadoop-ozone/docs/content/JavaApi.md

@@ -129,8 +129,12 @@ introStream.close();
 Here is a complete example of the code that we just wrote. Please note the close functions being called in this program.
 
 {{< highlight java >}}
+// Let us create a client
 OzoneClient ozClient = OzoneClientFactory.getClient();
 
+// Get a reference to the ObjectStore using the client
+ObjectStore objectStore = ozClient.getObjectStore();
+
 // Let us create a volume to store our game assets.
 // This default arguments for creating that volume.
 objectStore.createVolume(“assets”);

hadoop-ozone/docs/content/OzoneFS.md

@@ -32,8 +32,8 @@ To create an ozone file system, we have to choose a bucket where the file system
 Please run the following commands to create a volume and bucket, if you don't have them already.
 
 {{< highlight bash >}}
-ozone oz volume create /volume
-ozone oz bucket create /volume/bucket
+ozone sh volume create /volume
+ozone sh bucket create /volume/bucket
 {{< /highlight >}}
 
 Once this is created, please make sure that bucket exists via the listVolume or listBucket commands.
@@ -56,7 +56,7 @@ This will make this bucket to be the default file system for HDFS dfs commands a
 You also need to add the ozone-filesystem.jar file to the classpath:
 
 {{< highlight bash >}}
-export HADOOP_CLASSPATH=/opt/ozone/share/hadoop/ozonefs/hadoop-ozone-filesystem.jar
+export HADOOP_CLASSPATH=/opt/ozone/share/hadoop/ozonefs/hadoop-ozone-filesystem.jar:$HADOOP_CLASSPATH
 {{< /highlight >}}