Fix Typo in Metadata API Description (#51024)
### Fix Typo in Metadata API Description
#### Description:
This PR fixes a minor typo in the description of the Metadata API.
#### Changes:
- Fixed typo in the Metadata API description.
**File:** `docs/02-app/01-building-your-application/05-optimizing/04-metadata.mdx`
**Old Sentence:**
> Next.js has a Metadata API that can used to define your application metadata (e.g. `meta` and `link` tags inside your HTML `head` element) for improved SEO and web shareability.
**New Sentence:**
> Next.js has a Metadata API that can be used to define your application metadata (e.g. `meta` and `link` tags inside your HTML `head` element) for improved SEO and web shareability.
This change helps improve the readability and understanding of the documentation for readers and users.
#### Checks:
- [x] Followed the Docs Contribution Guide
- [x] Linting passes (`pnpm build && pnpm lint`)
