For storybook 7 or higher, the code below does not work.

```js
export const parameters = {
  docs: {
    source: {
      state: 'open',
    },
  },
};
```

It should be fixed like below:

```js
export const parameters = {
  docs: {
    canvas: {
      sourceState: 'shown'
    }
  }
};
```

However, this document seems not changed so far. So I updated it.

## References:

- https://storybook.js.org/docs/api/doc-block-canvas#sourcestate
- storybookjs#10430