code: public StorageAccountInner update(String resourceGroupName, String accountName, StorageAccountUpdateParameters parameters) {
          return updateWithServiceResponseAsync(resourceGroupName, accountName, parameters).toBlocking().single().body();
      }
docs: The update operation can be used to update the SKU, encryption, access tier, or tags for a storage account. It can also be used to map the account to a custom domain. Only one custom domain is supported per storage account; the replacement/change of custom domain is not supported. In order to replace an old custom domain, the old value must be cleared/unregistered before a new value can be set. The update of multiple properties is supported. This call does not change the storage keys for the account. If you want to change the storage account keys, use the regenerate keys operation. The location and name of the storage account cannot be changed after creation.
  
  @param resourceGroupName The name of the resource group within the user's subscription. The name is case insensitive.
  @param accountName The name of the storage account within the specified resource group. Storage account names must be between 3 and 24 characters in length and use numbers and lower-case letters only.
  @param parameters The parameters to provide for the updated account.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the StorageAccountInner object if successful.