code: def rates(table_rows)
        table_rows.map do |e|
          e.css('.content').map(&:text).map(&:strip).map do |txt|
            txt.split("\n").map(&:strip)
          end
        end
      end
docs: Extract the text descriping the exchange rates from content <p> nodes
   @return [Array<Array>] text description for buy/sell rates