Update manual-setup.mdx

Author: atticoos

docs/platforms/javascript/guides/remix/manual-setup.mdx

@@ -303,9 +303,9 @@ To verify that Sentry captures errors and creates issues in your Sentry project,
 ```javascript
 <button
   type="button"
-  onClick={
+  onClick={() => {
 	  throw new Error("Sentry Example Frontend Error");
-  }
+  }}
 >
   <span>
     Throw Sample Error