Added migration documentation for iOS window properties

Fixes https://github.com/libsdl-org/SDL/issues/9430

src/video/uikit/SDL_uikitopengles.m

@@ -171,6 +171,11 @@ SDL_GLContext UIKit_GL_CreateContext(SDL_VideoDevice *_this, SDL_Window *window)
             return NULL;
         }
 
+        SDL_PropertiesID props = SDL_GetWindowProperties(window);
+        SDL_SetNumberProperty(props, SDL_PROP_WINDOW_UIKIT_OPENGL_FRAMEBUFFER_NUMBER, view.drawableFramebuffer);
+        SDL_SetNumberProperty(props, SDL_PROP_WINDOW_UIKIT_OPENGL_RENDERBUFFER_NUMBER, view.drawableRenderbuffer);
+        SDL_SetNumberProperty(props, SDL_PROP_WINDOW_UIKIT_OPENGL_RESOLVE_FRAMEBUFFER_NUMBER, view.msaaResolveFramebuffer);
+
         /* The context owns the view / drawable. */
         context.sdlView = view;