Document Next.js + Vercel changes

[lforst]

We need to document a few changes we did on Next.js + Vercel:

• Running the SDK on the edge runtime (sentry.edge.cofing.js) feat(nextjs): Add Edge Runtime SDK sentry-javascript#6752
• document the withSentryMiddleware wrapper feat(nextjs): Add edge route and middleware wrappers sentry-javascript#6771
• document how to opt out of auto-wrapping feat(nextjs): Auto-wrap edge-routes and middleware sentry-javascript#6746
• New wrapper names ref(nextjs): Rename wrapper functions sentry-javascript#6788