Fix the snippet from the example on how to set up the browser integration (#11843)

Author: jakubadamw

docs/platforms/javascript/common/configuration/integrations/browsertracing.mdx

@@ -34,6 +34,6 @@ Read more about [setting up BrowserTracing](./../../../tracing/).
 
 ```JavaScript
 Sentry.init({
-  integrations: [new Sentry.browserTracingIntegration()],
+  integrations: [Sentry.browserTracingIntegration()],
 });
 ```