SDL: Added a note for the SDL_CommonEvent type

From 6c11449cd44756f058fbdd8a79a4c1df1a85754a Mon Sep 17 00:00:00 2001
From: Sam Lantinga <[EMAIL REDACTED]>
Date: Thu, 14 Mar 2024 09:00:47 -0700
Subject: [PATCH] Added a note for the SDL_CommonEvent type

---
 include/SDL3/SDL_events.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/SDL3/SDL_events.h b/include/SDL3/SDL_events.h
index 61dd41d63223b..581af301013e6 100644
--- a/include/SDL3/SDL_events.h
+++ b/include/SDL3/SDL_events.h
@@ -240,7 +240,7 @@ typedef enum
  */
 typedef struct SDL_CommonEvent
 {
-    Uint32 type;
+    Uint32 type;        /**< Event type, shared with all events, Uint32 to cover user events which are not in the SDL_EventType enumeration */
     Uint32 reserved;
     Uint64 timestamp;   /**< In nanoseconds, populated using SDL_GetTicksNS() */
 } SDL_CommonEvent;