docs: update window customization tutorial (#43388)

docs/tutorial/window-customization.md

@@ -97,7 +97,7 @@ The [Window Controls Overlay API][] is a web standard that gives web apps the ab
 customize their title bar region when installed on desktop. Electron exposes this API
 through the `BrowserWindow` constructor option `titleBarOverlay`.
 
-This option only works whenever a custom `titlebarStyle` is applied on macOS or Windows.
+This option only works whenever a custom `titlebarStyle` is applied.
 When `titleBarOverlay` is enabled, the window controls become exposed in their default
 position, and DOM elements cannot use the area underneath this region.
 
@@ -107,7 +107,6 @@ Specifying `true` on either platform will result in an overlay region with defau
 system colors:
 
 ```js title='main.js'
-// on macOS or Windows
 const { BrowserWindow } = require('electron')
 const win = new BrowserWindow({
   titleBarStyle: 'hidden',