Sync SDL3 header -> wiki

SDL3/SDL_EVENT_PRIVATE0.md

@@ -0,0 +1,8 @@
+###### (This is the documentation for SDL3, which is the current stable version. [SDL2](https://wiki.libsdl.org/SDL2/) was the previous version!)
+# SDL_EVENT_PRIVATE0
+
+Please refer to [SDL_EventType](SDL_EventType) for details.
+
+----
+[CategoryAPI](CategoryAPI), [CategoryAPIEnumerators](CategoryAPIEnumerators)
+

SDL3/SDL_EVENT_PRIVATE1.md

@@ -0,0 +1,8 @@
+###### (This is the documentation for SDL3, which is the current stable version. [SDL2](https://wiki.libsdl.org/SDL2/) was the previous version!)
+# SDL_EVENT_PRIVATE1
+
+Please refer to [SDL_EventType](SDL_EventType) for details.
+
+----
+[CategoryAPI](CategoryAPI), [CategoryAPIEnumerators](CategoryAPIEnumerators)
+

SDL3/SDL_EVENT_PRIVATE2.md

@@ -0,0 +1,8 @@
+###### (This is the documentation for SDL3, which is the current stable version. [SDL2](https://wiki.libsdl.org/SDL2/) was the previous version!)
+# SDL_EVENT_PRIVATE2
+
+Please refer to [SDL_EventType](SDL_EventType) for details.
+
+----
+[CategoryAPI](CategoryAPI), [CategoryAPIEnumerators](CategoryAPIEnumerators)
+

SDL3/SDL_EVENT_PRIVATE3.md

@@ -0,0 +1,8 @@
+###### (This is the documentation for SDL3, which is the current stable version. [SDL2](https://wiki.libsdl.org/SDL2/) was the previous version!)
+# SDL_EVENT_PRIVATE3
+
+Please refer to [SDL_EventType](SDL_EventType) for details.
+
+----
+[CategoryAPI](CategoryAPI), [CategoryAPIEnumerators](CategoryAPIEnumerators)
+

SDL3/SDL_EventType.md

@@ -182,6 +182,12 @@ typedef enum SDL_EventType
  SDL_EVENT_RENDER_TARGETS_RESET = 0x2000, /**< The render targets have been reset and their contents need to be updated */
  SDL_EVENT_RENDER_DEVICE_RESET, /**< The device has been reset and all textures need to be recreated */
 
+ /* Reserved events for private platforms */
+ SDL_EVENT_PRIVATE0 = 0x4000,
+ SDL_EVENT_PRIVATE1,
+ SDL_EVENT_PRIVATE2,
+ SDL_EVENT_PRIVATE3,
+
  /* Internal events */
  SDL_EVENT_POLL_SENTINEL = 0x7F00, /**< Signals the end of an event poll cycle */