docs: replace electron.atom.io with electronjs.org in docs/fiddles (#22196)

docs/fiddles/native-ui/external-links-file-manager/external-links/index.html

@@ -27,7 +27,7 @@
                 const { shell } = require('electron')
                 const exLinksBtn = document.getElementById('open-ex-links')
                 exLinksBtn.addEventListener('click', (event) => {
-                shell.openExternal('http://electron.atom.io')
+                shell.openExternal('https://electronjs.org')
                 }) 
             </code></pre>
 

docs/fiddles/native-ui/external-links-file-manager/external-links/renderer.js

@@ -3,7 +3,7 @@ const { shell } = require('electron')
 const exLinksBtn = document.getElementById('open-ex-links')
 
 exLinksBtn.addEventListener('click', (event) => {
-  shell.openExternal('http://electron.atom.io')
+  shell.openExternal('https://electronjs.org')
 })
 
 const OpenAllOutboundLinks = () => {

docs/fiddles/native-ui/external-links-file-manager/index.html

@@ -17,7 +17,7 @@
       <p>This module works in both the main and renderer process.</p>
       <p>
         Open the
-        <a href="http://electron.atom.io/docs/api/shell">
+        <a href="https://electronjs.org/docs/api/shell">
           full API documentation (opens in new window)
         </a>
         in your browser.

docs/fiddles/native-ui/external-links-file-manager/renderer.js

@@ -9,5 +9,5 @@ fileManagerBtn.addEventListener('click', (event) => {
 })
 
 exLinksBtn.addEventListener('click', (event) => {
-  shell.openExternal('http://electron.atom.io')
+  shell.openExternal('https://electronjs.org')
 })