[Nokia N-Gage] Re-enable FPS counter, fix link in README.

- Re-enable FPS counter, which is hidden by default anyway - but essential while working on an actual project.
- Fix link in the platform's README.
- Re-order list of supported platforms (alphabetical order to maintain consistency).

docs/README-ngage.md

@@ -44,7 +44,7 @@ a state-of-the-art C23 compiler.  The irony writes itself.
 ## Existing Issues and Limitations
 
 - For now, the new
- [SDL3 main callbacks](https://wiki.libsdl.org/SDL3/README/main-functions#how-to-use-main-callbacks-in-sdl3)
+ [SDL3 main callbacks](https://wiki.libsdl.org/SDL3/README-main-functions#main-callbacks-in-sdl3)
  are not optional and must be used. This is important as the callbacks
  are optional on other platforms.
 

docs/README-platforms.md

@@ -12,6 +12,7 @@
 - [NetBSD](README-bsd.md)
 - [Nintendo Switch](README-switch.md)
 - [Nintendo 3DS](README-n3ds.md)
+- [Nokia N-Gage](README-ngage.md)]
 - [OpenBSD](README-bsd.md)
 - [PlayStation 2](README-ps2.md)
 - [PlayStation 4](README-ps4.md)
@@ -24,7 +25,6 @@
 - [Windows](README-windows.md)
 - [Windows GDK](README-gdk.md)
 - [Xbox](README-gdk.md)
-- [Nokia N-Gage](README-ngage.md)
 
 ## Unsupported Platforms