Fix stepper.when usage in use-stepper.mdx

[Woofer21]

Description

There was a syntax error in an example in the user-stepper.mdx, this fixes that so if you copy-paste it into your project it works.

Checklist

• [x] My code follows the code style of this project.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.
• [x] I have updated the documentation (if necessary).
• [x] I have checked the build and it works as expected.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: bd2dd7f342692b763052248e7174660c2dfd51c9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | ---- | ----- | | docs | Patch |

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Name	Status	Preview	Comments	Updated (UTC)
stepperize	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 2, 2024 2:14am