message: fix(callout): deleted buttongroup example
diff: import './index.scss';
  -import { ArrowDown20, ArrowRight20, Pdf20 } from '@carbon/icons-react';
  -import { number, select, text, withKnobs } from '@storybook/addon-knobs';
  -import ButtonGroup from '../../ButtonGroup/ButtonGroup';
  import Callout from '../Callout';
  import React from 'react';
  import readme from '../README.md';
  import { storiesOf } from '@storybook/react';
  +import { withKnobs } from '@storybook/addon-knobs';
  storiesOf('Patterns (Sub-Patterns)|Callout', module)
  .addDecorator(withKnobs)
  @@ -14,45 +12,6 @@ storiesOf('Patterns (Sub-Patterns)|Callout', module)
  sidebar: readme,
  },
  })
  - .add('With Button Group example', () => {
  - const iconMap = {
  - ArrowRight20,
  - ArrowDown20,
  - Pdf20,
  - };
  -
  - const iconOptions = {
  - None: null,
  - 'Arrow Right': 'ArrowRight20',
  - 'Arrow Down': 'ArrowDown20',
  - PDF: 'Pdf20',
  - };
  -
  - const buttonCount = number('Number of buttons', 2);
  - const buttons = [];
  -
  - for (let i = 0; i < buttonCount; i++) {
  - buttons.push({
  - href: text(`Link ${i + 1}`, `https://example.com`),
  - copy: text(`Button ${i + 1}`, `Button ${i + 1}`),
  - renderIcon:
  - iconMap[
  - select(`Icon ${i + 1}`, iconOptions, iconOptions['Arrow Right'])
  - ],
  - });
  - }
  - const children = <ButtonGroup buttons={buttons} />;
  -
  - return (
  - <div className="bx--grid">
  - <div className="bx--row">
  - <div className="bx--col-sm-4 bx--col-lg-8 bx--col-lg-12 bx--offset-lg-4">
  - <Callout children={children} />
  - </div>
  - </div>
  - </div>
  - );
  - })
  .add('Simple example', () => {
  const children = <p style={{ color: 'white' }}>hello world</p>;
  