Fix url of tRPC's next-minimal-starter (#38452)

Fix url of tRPC's `next-minimal-starter`

## Documentation / Examples

- [x] Make sure the linting passes by running `pnpm lint`
- [x] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)

examples/with-trpc/README.md

@@ -10,4 +10,4 @@
 
 ## Next.js + tRPC minimal implementation
 
-- https://github.com/trpc/examples-next-minimal-starter
+- https://github.com/trpc/trpc/tree/main/examples/next-minimal-starter