Update env next import docs for Next v15

[JulianKingman]

Next 15 allows importing directly into next.config.ts

Seems to be working great, much easier to use.

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Name	Status	Preview	Comments	Updated (UTC)
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[bennajah]

@JulianKingman

Is it correct that when using split env files for server and client, we just need to import both like this?

// next.config.ts
import type { NextConfig } from "next";

import "@/env/server";
import "@/env/client";

const nextConfig: NextConfig = {};

export default nextConfig;