docs: fix generateImageMetadata example to use normal params object (#85658)
### What?
Fixes an inconsistency in the v16 upgrade documentation for
`generateImageMetadata`.
### Why?
In the “Upgrading to Version 16” guide, the example incorrectly awaited
the `params` object inside `generateImageMetadata`, implying that it was
a Promise.
However, according to the API reference, `params` is a normal object.
This PR updates the example to reflect the correct synchronous usage.
### How?
Replaced:
```ts
export async function generateImageMetadata({ params }) {
const { slug } = await params
return [{ id: '1' }, { id: '2' }]
}
With
```ts
export async function generateImageMetadata({ params }) {
// params is a normal object
return [{ id: '1' }, { id: '2' }]
}
---------
Co-authored-by: Joseph <joseph.chamochumbi@vercel.com>
next.js
b350da47 - docs: fix generateImageMetadata example to use normal params object (#85658)
