Fix some formatting errors

Author: Alex Krawiec

docs/product/sentry-basics/distributed-tracing/generate-first-error.mdx

@@ -30,7 +30,7 @@ If you're using your own source code, skip this step. Instead, select your [plat
 ```
 Take note that in the `server.js` file of the `tracing-tutorial-backend` repo, there is a middleware function handling the `/products/debug-sentry` route, which throws a sample error:
 
-```javascript{filename:server.js}
+```javascript {filename:server.js}
 app.get("/products/debug-sentry", (req, res) => {
     console.log('Sentry Error thrown!');
     throw new Error("My first Sentry error!");

docs/product/sentry-basics/distributed-tracing/initialize-sentry-sdk-backend.mdx

@@ -92,7 +92,7 @@ The options set in `Sentry.init()` are called the SDK's configuration. The only
 
 The configuration above enables Sentry's error monitoring feature, as well as its [Performance](/platforms/javascript/guides/react/performance) (tracing) and [Session Replay](/platforms/javascript/guides/react/session-replay) features.
 
-Make sure to import `instrument.js` at the top of your `server.js` file, and set up the error handler after all controllers and before any other middleware:
+Make sure to import `instrument.js` at the top of your `server.js` file, as well as importing `Sentry` and setting up the error handler after all controllers and before any other middleware:
 
  ``` javascript {filename:server.js}
     // IMPORTANT: Make sure to import `instrument.js` at the top of your file.
@@ -115,6 +115,11 @@ Make sure to import `instrument.js` at the top of your `server.js` file, and set
         res.send('<h1>Hello, Express.js Server here!</h1>');
     });
 
+    app.get("/products/debug-sentry", (req, res) => {
+      console.log("Sentry Error thrown!");
+      throw new Error("My first Sentry error!");
+    });
+
     // The error handler must be registered before any other error middleware and after all controllers
     Sentry.setupExpressErrorHandler(app);