Merge pull request #6071 from banyudu/patch-2

DocFixit: fix spell error

docs/tutorial/desktop-environment-integration.md

@@ -221,7 +221,7 @@ win.setThumbarButtons([
   {
     tooltip: 'button1',
     icon: path.join(__dirname, 'button1.png'),
-    click() { console.log('button2 clicked'); }
+    click() { console.log('button1 clicked'); }
   },
   {
     tooltip: 'button2',