Fix typo of README of canteen page

[netlify[bot]]

✅ Deploy Preview for sustech-online-preview ready!

Name	Link
🔨 Latest commit	83484075182cae2adea0045c7c0c1f9ed3dbdc9a
🔍 Latest deploy log	https://app.netlify.com/sites/sustech-online-preview/deploys/65ae599bf3342f00086f031b
😎 Deploy Preview	https://deploy-preview-162--sustech-online-preview.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

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