Examples: SDL3+Metal: Amend example. (#8827, #8825)

Amend 8403c49

docs/CHANGELOG.txt

@@ -52,6 +52,7 @@ Other Changes:
   facilitate using in C++ modules. (#8813, #8682, #8358) [@stripe2933]
 - CI: Added SDL3 builds to MacOS and Windows. (#8819, #8778) [@scribam]
 - CI: Updated Windows CI to use a more recent SDL2. (#8819, #8778) [@scribam]
+- Examples: SDL3+Metal: added SDL3+Metal example. (#8827, #8825) [@shi-yan]
 - Backends: OpenGL3: add and call embedded loader shutdown in ImGui_ImplOpenGL3_Shutdown() 
   to facilitate multiple init/shutdown cycles in same process. (#8792) [@tim-rex]
 - Backends: OpenGL2, OpenGL3: set GL_UNPACK_ALIGNMENT to 1 before updating 

docs/EXAMPLES.md

@@ -149,6 +149,10 @@ SDL2 (Win32, Mac, Linux, etc.) + Vulkan example. <BR>
 This is quite long and tedious, because: Vulkan. <BR>
 For this example, the main.cpp file exceptionally use helpers function from imgui_impl_vulkan.h/cpp.
 
+[example_sdl3_metal/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl3_metal/) <BR>
+SDL3 + Metal example (Mac). <BR>
+= main.cpp + imgui_impl_sdl3.cpp + imgui_impl_metal.mm <BR>
+
 [example_sdl3_opengl3/](https://github.com/ocornut/imgui/blob/master/examples/example_sdl3_opengl3/) <BR>
 SDL3 (Win32, Mac, Linux, etc.) + OpenGL3+/ES2/ES3 example. <BR>
 = main.cpp + imgui_impl_sdl3.cpp + imgui_impl_opengl3.cpp <BR>