Sync SDL3 header -> wiki

SDL3/SDL_GetDisplays.md

@@ -15,9 +15,9 @@ SDL_DisplayID* SDL_GetDisplays(int *count);
 
 ## Function Parameters
 
-|       |           |                                                           |
-| ----- | --------- | --------------------------------------------------------- |
-| int * | **count** | a pointer filled in with the number of displays returned. |
+|       |           |                                                                        |
+| ----- | --------- | ---------------------------------------------------------------------- |
+| int * | **count** | a pointer filled in with the number of displays returned, may be NULL. |
 
 ## Return Value
 

SDL3/SDL_GetWindows.md

@@ -0,0 +1,34 @@
+###### (This is the documentation for SDL3, which is under heavy development and the API is changing! [SDL2](https://wiki.libsdl.org/SDL2/) is the current stable version!)
+# SDL_GetWindows
+
+Get a list of valid windows.
+
+## Header File
+
+Defined in [<SDL3/SDL_video.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_video.h)
+
+## Syntax
+
+```c
+extern SDL_DECLSPEC SDL_Window **SDLCALL SDL_GetWindows(int *count);
+```
+
+## Function Parameters
+
+|       |           |                                                                       |
+| ----- | --------- | --------------------------------------------------------------------- |
+| int * | **count** | a pointer filled in with the number of windows returned, may be NULL. |
+
+## Return Value
+
+([SDL_Window](SDL_Window) **) Returns a 0 terminated array of window
+pointers which should be freed with [SDL_free](SDL_free)(), or NULL on
+error; call [SDL_GetError](SDL_GetError)() for more details.
+
+## Version
+
+This function is available since SDL 3.0.0.
+
+----
+[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryVideo](CategoryVideo)
+