message: chore(docs): update readme with cta styles
diff: @@ -122,7 +122,7 @@ ReactDOM.render(<App />, document.querySelector('#app'));
  | --------- | -------- | --------- | ------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
  | `heading` | YES | String | n/a | Title of the content block. |
  | `copy` | YES | String | n/a | Simple content item. Uses [`markdownToHtml`](https://github.com/carbon-design-system/ibm-dotcom-library/tree/master/packages/utilities/src/utilities/markdownToHtml) utility. |
  -| `cta` | NO | Object | n/a | CTA used at the end of content body. `Text` and `Card` styles supported. |
  +| `cta` | NO | Object | n/a | CTA used at the end of content body. `Card` style supported. |
  | `items` | YES | Object | null | Supports [`ContentGroupCards`](https://github.com/carbon-design-system/ibm-dotcom-library/tree/master/packages/react/src/patterns/blocks/ContentGroupCards), [`ContentGroupPictograms`](https://github.com/carbon-design-system/ibm-dotcom-library/tree/master/packages/react/src/patterns/blocks/ContentGroupPictograms), and [`ContentGroupSimple`](https://github.com/carbon-design-system/ibm-dotcom-library/tree/master/packages/react/src/patterns/blocks/ContentGroupSimple) pattern groups. See patterns for full usage details. |
  ### Stable selectors
  