Docs: Update button-story-default-export-with-component.ts.mdx

[wuzhuobin]

Closes #

What I did

Fix incorrect export doc

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

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• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
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  • feature request: Introducing a new feature.
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[jonniebigodes]

@wuzhuobin, thanks for putting together this pull request and helping us improve the documentation by catching this small but rather important issue in our documentation. We appreciate it 🙏 ! I've checked and all is good on my end and going to merge this once the checklist clears.

Have a fantastic day.

Stay safe