code: func NewDocument(text string) *Document {
  	wTok := tokenize.NewWordBoundaryTokenizer()
  	sTok := tokenize.NewPunktSentenceTokenizer()
  	doc := Document{Content: text, WordTokenizer: wTok, SentenceTokenizer: sTok}
  	doc.Initialize()
  	return &doc
  }
docs: // NewDocument is a Document constructor that takes a string as an argument. It
  // then calculates the data necessary for computing readability and usage
  // statistics.
  //
  // This is a convenience wrapper around the Document initialization process
  // that defaults to using a WordBoundaryTokenizer and a PunktSentenceTokenizer
  // as its word and sentence tokenizers, respectively.