docs(nextjs): Add troubleshooting section for nx

[chargome]

closes getsentry/sentry-javascript#8982

[vercel]

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[codecov]

Bundle Report

Changes will decrease total bundle size by 15 bytes (-0.0%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
sentry-docs-server-cjs	10.34MB	9 bytes (-0.0%) ⬇️
sentry-docs-client-array-push	9.27MB	6 bytes (-0.0%) ⬇️

[lforst]

Suggested change

	If you want to set up Sentry's Next.js SDK in an Nx monorepo context, please refer to [this guide](https://nx.dev/recipes/next/next-config-setup#manually-composing-plugins-nx-15-and-prior).
	To set up Sentry's Next.js SDK in an Nx monorepo, please refer to [this guide](https://nx.dev/recipes/next/next-config-setup#manually-composing-plugins-nx-15-and-prior).

The guide above is actually harmful af 🤦

I would almost put this code snippet here:

// next.config.js

const nextConfig = {
  // ...
};

const plugins = [
  // Your plugins excluding withNx
];

module.exports = async (phase, context) => {
  let updatedConfig = plugins.reduce((acc, fn) => fn(acc), nextConfig);

  // Apply the async function that `withNx` returns.
  updatedConfig = await withNx(updatedConfig)(phase, context);

  return updatedConfig;
};

// The Sentry plugin should always be applied last
const { withSentryConfig } = require('@sentry/nextjs');
module.exports = withSentryConfig(module.exports)