docs: Adds Dialogs Fiddle example (#20473)

docs/fiddles/native-ui/dialogs/error-dialog/renderer.js

@@ -0,0 +1,18 @@
+const { ipcRenderer, shell } = require('electron')
+
+const links = document.querySelectorAll('a[href]')
+const errorBtn = document.getElementById('error-dialog')
+
+errorBtn.addEventListener('click', event => {
+  ipcRenderer.send('open-error-dialog')
+})
+
+Array.prototype.forEach.call(links, (link) => {
+  const url = link.getAttribute('href')
+  if (url.indexOf('http') === 0) {
+    link.addEventListener('click', (e) => {
+      e.preventDefault()
+      shell.openExternal(url)
+    })
+  }
+})