code: public ProjectFileInner update(String groupName, String serviceName, String projectName, String fileName, ProjectFileInner parameters) {
          return updateWithServiceResponseAsync(groupName, serviceName, projectName, fileName, parameters).toBlocking().single().body();
      }
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
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws ApiErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the ProjectFileInner object if successful.