Add missing parameters and return types to SDL2 header docs (#13162)

include/SDL_video.h

@@ -1315,6 +1315,7 @@ extern DECLSPEC int SDLCALL SDL_SetWindowFullscreen(SDL_Window * window,
 /**
  * Return whether the window has a surface associated with it.
  *
+ * \param window the window to query.
  * \returns SDL_TRUE if there is a surface associated with the window, or
  *          SDL_FALSE otherwise.
  *