SDL3/SDL_GetDisplayForWindow: Add a code example

Live page is here: https://wiki.libsdl.org/SDL3/SDL_GetDisplayForWindow

SDL3/SDL_GetDisplayForWindow.md

@@ -29,6 +29,39 @@ containing the center of the window on success or 0 on failure; call
 
 This function is available since SDL 3.1.3.
 
+## Code Examples
+
+```c
+// Example program
+// Use SDL3 to log which display a window was created on
+
+#include <SDL3/SDL_log.h>
+#include <SDL3/SDL_main.h>
+#include <SDL3/SDL_video.h>
+
+int
+main(int argc, char** argv)
+{
+  if (!SDL_Init(SDL_INIT_VIDEO)) {
+    SDL_Log("Unable to initialize SDL: %s", SDL_GetError());
+    return 0;
+  }
+
+  SDL_Window* window = SDL_CreateWindow("My Window", 640, 480, 0);
+  if(window == NULL) {
+    SDL_Log("Unable to create window: %s", SDL_GetError());
+    return 0;
+  }
+
+  SDL_DisplayID display_id = SDL_GetDisplayForWindow(window);
+  SDL_Log("Window created on display '%s'", SDL_GetDisplayName(display_id));
+
+  SDL_DestroyWindow(window);
+
+  return 0;
+}
+```
+
 ## See Also
 
 - [SDL_GetDisplayBounds](SDL_GetDisplayBounds)