N-Gage port: add changes from code reviews, overall cleanup (#5618)

* Add changes from code review by @ccawley2011, #5597, overall cleanup

* Update N-Gage README, minor cleanup and rephrasing

* Call SDL_SetMainReady() before calling SDL_main, return SDL_main instead of main

docs/README-ngage.md

@@ -1,7 +1,7 @@
 Nokia N-Gage
 ============
 
-SDL2 port for Symbian S60v1/2 with a main focus on the Nokia N-Gage
+SDL2 port for Symbian S60v1 and v2 with a main focus on the Nokia N-Gage
 (Classic and QD) by [Michael Fitzmayer](https://github.com/mupfdev).
 
 Compiling
@@ -13,8 +13,7 @@ The library is included in the
 sub-module.
 
 A complete example project based on SDL2 can be found in the GitHub
-account of the SDK: [Example
-project](https://github.com/ngagesdk/wordle).
+account of the SDK: [Wordle](https://github.com/ngagesdk/wordle).
 
 Current level of implementation
 -------------------------------
@@ -30,8 +29,9 @@ Acknowledgements
 ----------------
 
 Thanks to Hannu Viitala, Kimmo Kinnunen and Markus Mertama for the
-valuable insight into Symbian programming.  Without the SDL 1.2 port for
-CDoom, this adaptation would not have been possible.
+valuable insight into Symbian programming.  Without the SDL 1.2 port
+which was specially developed for CDoom (Doom for the Nokia 9210), this
+adaptation would not have been possible.
 
 I would like to thank my friends
 [Razvan](https://twitter.com/bewarerazvan) and [Dan
@@ -39,6 +39,6 @@ Whelan](https://danwhelan.ie/), for their continuous support.  Without
 you and the [N-Gage community](https://discord.gg/dbUzqJ26vs), I would
 have lost my patience long ago.
 
-Last but not least, I would like to say a special thank you to the
-[EKA2L1](https://12z1.com/) team.  Thank you for all your patience and
-support in troubleshooting.
+Last but not least, I would like to thank the development team of
+[EKA2L1](https://12z1.com/) (an experimental Symbian OS emulator). Your
+patience and support in troubleshooting helped me a lot.