docs: `Nuxt OG Image Playground` example link has been changed.

[gangan]

📚 Is your documentation request related to a problem?

The following is currently set for the Nuxt OG Image Playground sample link.

• devtools/docs/content/2.module/0.guide.md

  Line 190 in 0980de1

   - [Nuxt OG Image Playground](https://github.com/harlan-zw/nuxt-og-image/blob/main/src/module.ts#L136) 

When I jumped to the link, I confirmed that the implementation of the link has changed and the link is not working properly.

🔍 Where should you find it?

page: https://devtools.nuxt.com/module/guide#examples

item: Nuxt OG Image Playground

ℹ️ Additional context

The solution is already in mine. Therefore, I would like to create even a Pull Request on my end.