docs(composition-api.md): fix typo

[netlify[bot]]

✅ Deploy Preview for vue-router ready!

Name	Link
🔨 Latest commit	8d6cde638c368c36e8da128acb993794f6a86ef0
🔍 Latest deploy log	https://app.netlify.com/sites/vue-router/deploys/66678e82ed50260008637d2a
😎 Deploy Preview	https://deploy-preview-2265--vue-router.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 97 (🟢 up 2 from production) Accessibility: 100 (no change from production) Best Practices: 92 (no change from production) SEO: 92 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.