docs: remove references to remote from docs (#25416)

docs/fiddles/windows/manage-windows/frameless-window/main.js

@@ -1,13 +1,14 @@
 // Modules to control application life and create native browser window
 const { app, BrowserWindow } = require('electron')
 
-// Keep a global reference of the window object, if you don't, the window will
-// be closed automatically when the JavaScript object is garbage collected.
-let mainWindow
+ipcMain.on('create-frameless-window', (event, {url}) => {
+  const win = new BrowserWindow({ frame: false })
+  win.loadURL(url)
+})
 
 function createWindow () {
   // Create the browser window.
-  mainWindow = new BrowserWindow({
+  const mainWindow = new BrowserWindow({
     width: 800,
     height: 600,
     webPreferences: {
@@ -17,17 +18,6 @@ function createWindow () {
 
   // and load the index.html of the app.
   mainWindow.loadFile('index.html')
-
-  // Open the DevTools.
-  // mainWindow.webContents.openDevTools()
-
-  // Emitted when the window is closed.
-  mainWindow.on('closed', function () {
-    // Dereference the window object, usually you would store windows
-    // in an array if your app supports multi windows, this is the time
-    // when you should delete the corresponding element.
-    mainWindow = null
-  })
 }
 
 // This method will be called when Electron has finished