docs: fix scoped-stepper link in define-stepper.mdx

[none23]

Closes https://github.com/damianricobelli/stepperize/issues/39

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Name	Status	Preview	Comments	Updated (UTC)
stepperize	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 20, 2024 1:14pm

[damianricobelli]

Thank you @none23 !