Added comments

Author: TetyanaYahodska

compute/cloud-client/src/main/java/compute/disks/storagepool/CreateHyperdiskStoragePool.java

@@ -48,6 +48,8 @@ public static void main(String[] args)
     long provisionedIops = 3000;
     // the throughput in MBps to provision for the storage pool.
     long provisionedThroughput = 140;
+    // Optional: the performance provisioning type of the storage pool.
+    // The allowed values are advanced and standard. If not specified, the value advanced is used.
     String performanceProvisioningType = "advanced";
 
     createHyperdiskStoragePool(projectId, zone, storagePoolName, storagePoolType,

compute/cloud-client/src/test/java/compute/disks/HyperdisksIT.java

@@ -113,7 +113,8 @@ public void stage1_CreateHyperdiskStoragePoolTest()
     Assert.assertEquals(10240, storagePool.getPoolProvisionedCapacityGb());
     Assert.assertTrue(storagePool.getStoragePoolType().contains("hyperdisk-balanced"));
     Assert.assertTrue(storagePool.getCapacityProvisioningType().equalsIgnoreCase("advanced"));
-    Assert.assertTrue(storagePool.getPerformanceProvisioningType().equalsIgnoreCase("advanced"));
+    Assert.assertTrue(storagePool.getPerformanceProvisioningType()
+        .equalsIgnoreCase(PERFORMANCE_PROVISIONING_TYPE));
     Assert.assertTrue(storagePool.getZone().contains(ZONE));
   }