added clarification on attribute for content items

Author: Pete Nelson

components/content-picker/readme.md

@@ -37,7 +37,7 @@ function MyComponent( props ) {
 | `isOrderable`         | `bool`     | `false`              | When true, will allow the user to order items. Must be used in conjunction with `maxContentItems > 1`                                                                                                                                                                                                                                                                                                                  |
 | `uniqueContentItems`  | `bool`     | `true`               | Prevent duplicate items from being picked.                                                                                                                                                                                                                                                                                                                                                                             |
 | `excludeCurrentPost`  | `bool`     | `true`               | Don't allow user to pick the current post. Only applicable on the editor screen.                                                                                                                                                                                                                                                                                                                                       |
-| `content`             | `array`    | `[]`                 | Array of items to pre-populate picker with. Must be in the format of: `[{id: 1, type: 'post', uuid: '...',}, {id: 1, uuid: '...', type: 'page'},... ]`. You cannot provide terms and posts to the same picker. `uuid` was added as of version 1.5.0. It is only used as the React component list key in the admin. If it is not included, `id` will be used which will cause errors if you select the same post twice. |
+| `content`             | `array`    | `[]`                 | Array of items to pre-populate picker with. Must be in the format of: `[{id: 1, type: 'post', uuid: '...',}, {id: 1, uuid: '...', type: 'page'},... ]`. You cannot provide terms and posts to the same picker. `uuid` was added as of version 1.5.0. It is only used as the React component list key in the admin. If it is not included, `id` will be used which will cause errors if you select the same post twice. For posts, `type` needs to be the post type of the item. |
 | `perPage`             | `number`   | `50`                 | Number of items to show during search
 | `fetchInitialResults` | `bool`     | `false`               | Fetch initial results to present when focusing the search input                                                                                          |
 | `options.inputDelay`  | `number`   | `undefined`                           | Debounce delay passed to the internal search input, defaults to 350ms                                                             |