SDL: Updated documentation with the SDL_WINDOW_ALLOW_HIGHDPI flag removal

From 62402527360b38abde6a072eaf3c3be97197156a Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Wed, 25 Jan 2023 01:28:37 -0800
Subject: [PATCH] Updated documentation with the SDL_WINDOW_ALLOW_HIGHDPI flag
 removal

---
 docs/README-migration.md | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/docs/README-migration.md b/docs/README-migration.md
index 755d7016d5c8..65d2a88703e7 100644
--- a/docs/README-migration.md
+++ b/docs/README-migration.md
@@ -950,7 +950,9 @@ SDL_GetRevisionNumber() has been removed from the API, it always returned 0 in S
 
 SDL_VideoInit() and SDL_VideoQuit() have been removed. Instead you can call SDL_InitSubSytem() and SDL_QuitSubSytem() with SDL_INIT_VIDEO, which will properly refcount the subsystems. You can choose a specific audio driver using SDL_VIDEO_DRIVER hint.
 
-'SDL_WINDOW_SHOW' flag has been removed. Windows are shown by default and can be created hidden by using the SDL_WINDOW_HIDDEN flag.
+The SDL_WINDOW_SHOWN flag has been removed. Windows are shown by default and can be created hidden by using the SDL_WINDOW_HIDDEN flag.
+
+The SDL_WINDOW_ALLOW_HIGHDPI flag has been removed. Windows are automatically high DPI aware and their coordinates are in screen space, which may differ from physical pixels on displays using display scaling.
 
 The refresh rate in SDL_DisplayMode is now a float.