Update events-and-parameters.mdx

In "Pass parameters to a Workflow" example
* Remove await from crypto.randomUUID() call
* Remove redundant return

Author: segeda

src/content/docs/workflows/build/events-and-parameters.mdx

@@ -35,16 +35,14 @@ export default {
     // Pass our event as the second parameter to the `create` method
     // on our Workflow binding.
     let instance = await env.MY_WORKFLOW.create({
-      id: await crypto.randomUUID(),
+      id: crypto.randomUUID(),
       params: someEvent
     });
 
     return Response.json({
       id: instance.id,
       details: await instance.status(),
     });
-
-    return Response.json({ result });
   },
 };
 ```