code: public ServiceFuture<ResourceGroupInner> updateAsync(String resourceGroupName, ResourceGroupPatchable parameters, final ServiceCallback<ResourceGroupInner> serviceCallback) {
          return ServiceFuture.fromResponse(updateWithServiceResponseAsync(resourceGroupName, parameters), serviceCallback);
      }
docs: Updates a resource group.
  Resource groups can be updated through a simple PATCH operation to a group address. The format of the request is the same as that for creating a resource group. If a field is unspecified, the current value is retained.
  
  @param resourceGroupName The name of the resource group to update. The name is case insensitive.
  @param parameters Parameters supplied to update a resource group.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object