Fix router transition start snippet (#13372)

Author: Luca Forstner

docs/platforms/javascript/guides/nextjs/manual-setup.mdx

@@ -94,7 +94,7 @@ Create three files in your application's root directory: `sentry.server.config.(
   slightly different, so copy them carefully.
 </Alert>
 
-```javascript {tabTitle:Client} {filename:instrumentation-client.(js|ts)} {"onboardingOptions": {"performance": "5-10, 26-28", "session-replay": "11-19"}}
+```javascript {tabTitle:Client} {filename:instrumentation-client.(js|ts)} {"onboardingOptions": {"performance": "5-10", "session-replay": "11-19"}}
 import * as Sentry from "@sentry/nextjs";
 
 Sentry.init({
@@ -107,14 +107,14 @@ Sentry.init({
   tracesSampleRate: 1.0,
   // Replay may only be enabled for the client-side
   integrations: [Sentry.replayIntegration()],
-  
+
   // Capture Replay for 10% of all sessions,
   // plus for 100% of sessions with an error
   // Learn more at
   // https://docs.sentry.io/platforms/javascript/session-replay/configuration/#general-integration-configuration
   replaysSessionSampleRate: 0.1,
   replaysOnErrorSampleRate: 1.0,
-  
+
   // Note: if you want to override the automatic release value, do not set a
   // `release` value here - use the environment variable `SENTRY_RELEASE`, so
   // that it will also get attached to your source maps