Update index.mdx

Author: lcian

docs/platforms/rust/guides/actix-web/index.mdx

@@ -44,6 +44,8 @@ fn main() -> io::Result<()> {
         "___PUBLIC_DSN___",
         sentry::ClientOptions {
             release: sentry::release_name!(),
+            // Capture all traces and spans. Set to a lower value in production.
+            traces_sample_rate: 1.0,
             // Capture user IPs and potentially sensitive headers when using HTTP server integrations
             // see https://docs.sentry.io/platforms/rust/data-management/data-collected for more info
             send_default_pii: true,
@@ -89,4 +91,4 @@ Learn more about manually capturing an error or message in our <PlatformLink to=
 
 </Alert>
 
-To view and resolve the recorded error, log into [sentry.io](https://sentry.io) and select your project. Clicking on the error's title will open a page where you can see detailed information and mark it as resolved.
+To view and resolve the recorded error, log into [sentry.io](https://sentry.io) and select your project. Clicking on the error's title will open a page where you can see detailed information and mark it as resolved.