message: Update native window documentation
diff: @@ -40,10 +40,12 @@ namespace filament {
  * parameter above must be of type:
  *
  * Platform | nativeWindow type
  - * :--------|:----------------------------:
  + * :---------------|:----------------------------:
  * Android | ANativeWindow*
  - * OSX | NSView*
  - * IOS | CAEAGLLayer*
  + * macOS - OpenGL | NSView*
  + * macOS - Metal | CAMetalLayer*
  + * iOS - OpenGL | CAEAGLLayer*
  + * iOS - Metal | CAMetalLayer*
  * X11 | Window
  * Windows | HWND
  *
  