[typescript] fix typo in edge runtime name (#41773)

There's a typo, the `l` is missing in "experimenta**l**-edge", so this
PR fixes it :sunglasses_+1:

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have a helpful link attached, see `contributing.md`

packages/next/server/next-typescript.ts

@@ -114,7 +114,7 @@ const API_DOCS: Record<
       'The `runtime` option controls the preferred runtime to render this route.',
     options: {
       '"nodejs"': 'Prefer the Node.js runtime.',
-      '"experimenta-edge"': 'Prefer the experimental Edge runtime.',
+      '"experimental-edge"': 'Prefer the experimental Edge runtime.',
     },
   },
 }