fix(website): fix typo in v3 preparation blog post

[DanRoscigno]

Missing "not"

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[github-actions]

⚡️ Lighthouse report for the deploy preview of this PR

URL	Performance	Accessibility	Best Practices	SEO	PWA	Report
/	🟢 96	🟢 97	🟢 92	🟢 100	🟠 89	Report
/docs/installation	🟠 81	🟢 98	🟢 92	🟢 100	🟠 89	Report

[slorber]

thanks 😅 good catch