code: public ServiceFuture<ProjectFileInner> updateAsync(String groupName, String serviceName, String projectName, String fileName, ProjectFileInner parameters, final ServiceCallback<ProjectFileInner> serviceCallback) {
          return ServiceFuture.fromResponse(updateWithServiceResponseAsync(groupName, serviceName, projectName, fileName, parameters), serviceCallback);
      }
docs: Update a file.
  This method updates an existing file.
  
  @param groupName Name of the resource group
  @param serviceName Name of the service
  @param projectName Name of the project
  @param fileName Name of the File
  @param parameters Information about the file
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object