code: func (f *Field) RowsLimit(limit int64) *PQLRowsQuery {
  	if limit < 0 {
  		return NewPQLRowsQuery("", f.index, errors.New("rows limit must be non-negative"))
  	}
  	text := fmt.Sprintf("Rows(field='%s',limit=%d)", f.name, limit)
  	return NewPQLRowsQuery(text, f.index, nil)
  }
docs: // RowsLimit creates a Rows query with the given limit