fix: Resolve missing closing backticks in performance page

learn/playwright/performance.mdx

@@ -210,10 +210,21 @@ test('basic performance paint timing', async ({ page }) => {
 
 ```json
 [
-  { name: 'first-paint', entryType: 'paint', startTime: 1149.5, duration: 0 },
-  { name: 'first-contentful-paint', entryType: 'paint', startTime: 1149.5, duration: 0 }
+  {
+    "name": "first-paint",
+    "entryType": "paint",
+    "startTime": 1149.5,
+    "duration": 0
+  },
+  {
+    "name": "first-contentful-paint",
+    "entryType": "paint",
+    "startTime": 1149.5,
+    "duration": 0
+  }
 ]
 
+```
 
 #### Largest Contentful Paint API (`largest-contentful-paint`)
 
@@ -354,7 +365,7 @@ The DevTools Protocol is quite extensive. We recommend exploring the [documentat
 
 Lighthouse can easily be used programmatically with Playwright to gather values and scores for different metrics, like [Time To Interactive (TTI)](https://web.dev/interactive/):
 
-```js 
+```js measure-performance.js
 const chromeLauncher = require('chrome-launcher')
 const { chromium } = require('playwright')
 const lighthouse = require('lighthouse')

learn/playwright/test-fixtures.mdx

@@ -28,8 +28,7 @@ At their core, fixtures in Playwright are predefined components like `page`, `co
 When writing multiple tests for a single site or service, you're likely to end up performing the same tasks over and over, so we'd like to add fixtures to our Playwright tests that developers can re-use, rather than copying and pasting big blocks of code. This helps us follow the DRY principle: don't repeat yourself when writing code!
 
 ## Why we need custom fixtures
-In our web shop, we've got a login process that we want to simulate and test before doing further account actions:
-
+In our [web shop](https://danube-webshop.herokuapp.com/), we've got a login process that we want to simulate and test before doing further account actions:
 ![A web shop login dialog](/images/samples/images/webshop-login.png)
 
 To open this dialog and log in, we might use some lines like the following: