re-add tracesSampleRate

Author: ArthurKnaus

docs/platforms/javascript/common/profiling/node-profiling.mdx

@@ -86,12 +86,14 @@ Sentry.init({
     // Add our Profiling integration
 +   nodeProfilingIntegration(),
   ],
+  tracesSampleRate: 1.0,
 + profileSessionSampleRate: 1.0,
 + profileLifecycle: 'manual',
 });
 
 Sentry.profiler.startProfiler();
 // Code executed between these two calls will be profiled
+// All spans (unless those discarded by sampling) will have profiling data attached to them.
 Sentry.profiler.stopProfiler();
 ```