SDL: Note that SDL_EVENT_SYSWM has been removed

From cde2dcd0d49f929aeb2ed3b6a4fc074482c1550c Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Wed, 27 Mar 2024 11:39:10 -0700
Subject: [PATCH] Note that SDL_EVENT_SYSWM has been removed

Fixes https://github.com/libsdl-org/SDL/issues/9382
---
 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 1a6ee51fcec05..82256fe87d89f 100644
--- a/docs/README-migration.md
+++ b/docs/README-migration.md
@@ -392,12 +392,14 @@ The following symbols have been renamed:
 * SDL_RENDER_DEVICE_RESET => SDL_EVENT_RENDER_DEVICE_RESET
 * SDL_RENDER_TARGETS_RESET => SDL_EVENT_RENDER_TARGETS_RESET
 * SDL_SENSORUPDATE => SDL_EVENT_SENSOR_UPDATE
-* SDL_SYSWMEVENT => SDL_EVENT_SYSWM
 * SDL_TEXTEDITING => SDL_EVENT_TEXT_EDITING
 * SDL_TEXTEDITING_EXT => SDL_EVENT_TEXT_EDITING_EXT
 * SDL_TEXTINPUT => SDL_EVENT_TEXT_INPUT
 * SDL_USEREVENT => SDL_EVENT_USER
 
+The following symbols have been removed:
+* SDL_SYSWMEVENT - you can use SDL_SetWindowsMessageHook() and SDL_SetX11EventHook() to watch and modify system events before SDL sees them.
+
 The following structures have been renamed:
 * SDL_ControllerAxisEvent => SDL_GamepadAxisEvent
 * SDL_ControllerButtonEvent => SDL_GamepadButtonEvent