docs: Current cacheing docs are invalid for NextJS App Router

[jeffrey-computers]

Area of Improvement

Currently documented tRPC cacheing methods (https://trpc.io/docs/server/caching) won't work with Next.JS' app router as they rely on setting headers which Next.js now overrides (https://nextjs.org/docs/app/api-reference/next-config-js/headers#cache-control).

As such - there is no documentation or examples (anywhere, as far as I can tell) for how to manage cacheing of tRPC endpoints running in a NextJS App Router environment.

Link to related docs

https://trpc.io/docs/server/caching

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