docs(nuxt): drop duplicate browser tracing integration (#12361)

It appears the browser tracing integration is automatically configured for Nuxt: https://github.com/getsentry/sentry-javascript/blob/e59055092c546274eb3767da56ec32944f14b075/packages/nuxt/src/runtime/plugins/sentry.client.ts#L45

I think it's enough to configure `tracePropagationTargets`, but please correct me if I'm wrong.

Author: dargmuesli

platform-includes/distributed-tracing/how-to-use/javascript.nuxt.mdx

@@ -3,7 +3,6 @@ If you're using the current version of our Nuxt SDK, distributed tracing will wo
 ```javascript {filename:sentry.client.config.(js|ts)}
 Sentry.init({
   dsn: "___PUBLIC_DSN___",
-  integrations: [Sentry.browserTracingIntegration()],
   tracePropagationTargets: ["https://myproject.org", /^\/api\//],
 });
 ```