docs: fix OG tags examples

[chenjiahan]

Summary

Fix OG tags examples, should use property and content.

Related Issue

https://ogp.me/

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

[netlify]

✅ Deploy Preview for aquamarine-blini-95325f ready!

Name	Link
🔨 Latest commit	9de8a1c
🔍 Latest deploy log	https://app.netlify.com/sites/aquamarine-blini-95325f/deploys/667f56a3be836c0008f92829
😎 Deploy Preview	https://deploy-preview-1221--aquamarine-blini-95325f.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 80 (🔴 down 8 from production) Accessibility: 97 (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.