update verify code snippets

Author: inventarSarah

platform-includes/getting-started-verify/javascript.connect.mdx

@@ -1,8 +1,10 @@
+### Issues
+
 First, let's make sure Sentry is correctly capturing errors and creating issues in your project. Add the following code snippet to your main application file; it defines a route that will deliberately trigger an error when called:
 
 ```javascript
-app.use("/debug-sentry", (req, res, next) => {
-  next(new Error("My first Sentry error!"));
+app.use("/debug-sentry", (req, res) => {
+  throw new Error("My first Sentry error!");
 });
 ```
 
@@ -13,15 +15,15 @@ app.use("/debug-sentry", (req, res, next) => {
 To test your tracing configuration, update the previous code snippet by starting a trace to measure the time it takes for the execution of your code:
 
 ```javascript
-app.use("/debug-sentry", async (req, res, next) => {
+app.use("/debug-sentry", async (req, res) => {
     await Sentry.startSpan(
       {
         op: "test",
         name: "My First Test Transaction",
       },
       async () => {
         await new Promise((resolve) => setTimeout(resolve, 100));
-        next(new Error("My first Sentry error!"));
+        throw new Error("My first Sentry error!");
       }
     );
   }