Updating tracing examples with practical scenarios

Author: codyde

docs/platforms/javascript/common/tracing/span-metrics/examples.mdx

@@ -6,13 +6,7 @@ sidebar_order: 10
 
 <Alert>
 
-These examples assume you have already <PlatformLink to="/tracing/">set up tracing</PlatformLink> in your application.
-
-</Alert>
-
-<Alert>
-
-The sample code contained within this page is for demonstration purposes only. It is not production-ready and may not be up to date with the latest version of Sentry. It's included as sample JavaScript code, and ultimately may not be for your specific language or framework.
+The sample code contained within this page is for demonstration purposes only. It is not production-ready. Examples are structural and ultimately may not be for your specific language or framework.
 
 </Alert>
 
@@ -308,7 +302,11 @@ app.post('/api/upload', async (req: Request<{}, {}, UploadRequest>, res: Respons
     }
   );
 });
+```
 
+**Backend — Async media processing**
+
+```typescript
 // Async media processing (runs in background via setImmediate)
 export async function processMedia(job: ProcessingJob): Promise<void> {
   await Sentry.startSpan(