fix slog

Author: ribice

docs/platforms/go/guides/slog/index.mdx

@@ -26,7 +26,6 @@ go get github.com/getsentry/sentry-go/slog
 To integrate Sentry with slog, you need to set up a Sentry handler and configure the Sentry client.
 
 ```go
-{"onboardingOptions": {"performance": "12-16"}}
 import (
 	"fmt"
 	"log"
@@ -126,4 +125,3 @@ logger.
 
 
 Note: Ensure Sentry is flushed before the application exits to avoid losing any pending events.
-