fixed snippet to be cloudflare specific

Author: Shannon Anahata

platform-includes/getting-started-config/javascript.cloudflare.workers.mdx

@@ -1,7 +1,6 @@
 Wrap your worker handler with the `withSentry` function, for example, in your `index.ts` file, to initialize the Sentry SDK and hook into the environment:
 
 ```typescript {filename:index.ts}
-import { Hono, HTTPException } from "hono";
 import * as Sentry from "@sentry/cloudflare";
 
 export default Sentry.withSentry(
@@ -30,7 +29,11 @@ export default Sentry.withSentry(
       // ___PRODUCT_OPTION_END___ performance
     };
   },
-  // your existing worker export
-  app
+  {
+    async fetch(request, env, ctx) {
+      // Your worker logic here
+      return new Response("Hello World!");
+    },
+  }
 );
 ```