code: func (f *Fpdf) SetKeywords(keywordsStr string, isUTF8 bool) {
  	if isUTF8 {
  		keywordsStr = utf8toutf16(keywordsStr)
  	}
  	f.keywords = keywordsStr
  }
docs: // SetKeywords defines the keywords of the document. keywordStr is a
  // space-delimited string, for example "invoice August". isUTF8 indicates if
  // the string is encoded