docs: fix example link to `Nuxt OG Image` (#608)

[shinGangan]

🔗 Linked issue

closed #607 .

❓ Type of change

• [x] 📖 Documentation (updates to the documentation or readme)
• [ ] 🐞 Bug fix (a non-breaking change that fixes an issue)
• [ ] 👌 Enhancement (improving an existing functionality)
• [ ] ✨ New feature (a non-breaking change that adds functionality)
• [ ] 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• [ ] ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

fix example link to Module Authors#Examples > Nuxt OG Image Playground.

• before: https://github.com/harlan-zw/nuxt-og-image/blob/main/src/module.ts#L136
• after: https://github.com/nuxt-modules/og-image/blob/551b5474b44b8ff3190643e861c0b453813683b0/src/build/devtools.ts#L65-L80

📝 Checklist

• [x] I have linked an issue or discussion.
• [ ] I have updated the documentation accordingly.

[nuxt-studio[bot]]

✅ Live Preview ready!

Name	Edit	Preview	Latest Commit
Devtools	Edit on Studio ↗︎	View Live Preview	2c9f4e6c50aca414326548015c273e100dfc4f36

[shinGangan]

Please review when you have a time. 🙏 This PR is low priority due to ducument modification.