code: func ReadFromFile(filePath string) (*FileConfig, error) {
  	f, err := os.Open(filePath)
  	if err != nil {
  		return nil, trace.Wrap(err, fmt.Sprintf("failed to open file: %v", filePath))
  	}
  	defer f.Close()
  	return ReadConfig(f)
  }
docs: // ReadFromFile reads Teleport configuration from a file. Currently only YAML
  // format is supported