ref(browser): Improve profiling debug statement (#18507)

Small log improvement as the log message was not quite clear. Before, it
read like it's related to the whole session, but this log is about each
span.


Closes #18508 (added automatically)

Author: s1gr1d

packages/browser/src/profiling/UIProfiler.ts

@@ -199,7 +199,8 @@ export class UIProfiler implements ContinuousProfiler<Client> {
   private _setupTraceLifecycleListeners(client: Client): void {
     client.on('spanStart', span => {
       if (!this._sessionSampled) {
-        DEBUG_BUILD && debug.log('[Profiling] Session not sampled because of negative sampling decision.');
+        DEBUG_BUILD &&
+          debug.log('[Profiling] Span not profiled because of negative sampling decision for user session.');
         return;
       }
       if (span !== getRootSpan(span)) {