Added documentation for SDL_DisplayID and SDL_WindowID for consistency.

include/SDL3/SDL_video.h

@@ -41,8 +41,25 @@
 extern "C" {
 #endif
 
-
+/**
+ * This is a unique ID for a display for the time it is connected to the
+ * system, and is never reused for the lifetime of the application.
+ *
+ * If the display is disconnected and reconnected, it will get a new ID.
+ *
+ * The value 0 is an invalid ID.
+ *
+ * \since This datatype is available since SDL 3.0.0.
+ */
 typedef Uint32 SDL_DisplayID;
+
+/**
+ * This is a unique ID for a window.
+ *
+ * The value 0 is an invalid ID.
+ *
+ * \since This datatype is available since SDL 3.0.0.
+ */
 typedef Uint32 SDL_WindowID;
 
 /* Global video properties... */