[docs] nested pie > bandWidths

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingSoft Demo</title>

  <script nonce="undefined" src="https://cdn.zingchart.com/zingchart.min.js"></script>
  <style></style>
</head>

<body>
  <div id='myChart'></div>
  <script>
    ZC.LICENSE = ["569d52cefae586f634c54f86dc99e6a9", "b55b025e438fa8a98e32482b5f768ff5"];
    let chartConfig = {
      type: 'nestedpie',
      title: {
        text: '"band-widths" attribute'
      },
      plot: {
        bandWidths: [30, 10, 20, 10, 20]
      },
      series: [{
          values: [59, 55, 30, 29, 25]
        },
        {
          values: [60, 50, 35, 31, 21]
        },
        {
          values: [50, 40, 30, 25, 19]
        },
        {
          values: [61, 59, 35, 31, 16]
        },
        {
          values: [65, 55, 45, 35, 25]
        }
      ]
    };

    zingchart.render({
      id: 'myChart',
      data: chartConfig,
      height: 400,
      width: '100%'
    });
  </script>
</body>

</html>

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>ZingSoft Demo</title>

  <script src="https://cdn.zingchart.com/zingchart.min.js"></script>
</head>

<body>
  <div id='myChart'></div>
</body>

</html>

let chartConfig = {
  type: 'nestedpie',
  title: {
    text: '"band-widths" attribute'
  },
  plot: {
    bandWidths: [30, 10, 20, 10, 20]
  },
  series: [{
      values: [59, 55, 30, 29, 25]
    },
    {
      values: [60, 50, 35, 31, 21]
    },
    {
      values: [50, 40, 30, 25, 19]
    },
    {
      values: [61, 59, 35, 31, 16]
    },
    {
      values: [65, 55, 45, 35, 25]
    }
  ]
};

zingchart.render({
  id: 'myChart',
  data: chartConfig,
  height: 400,
  width: '100%'
});