game entry file names changed to canonical version

games/cocos2d-x.md

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+# COCOS2D-X
+
+_Cocos2d-x is an open-source game framework written in C++._
+
+- Home: http://cocos2d-x.org/cocos2dx
+- Media: https://en.wikipedia.org/wiki/Cocos2d
+- State: mature
+- Download: http://cocos2d-x.org/download
+- Keywords: framework
+- Code repository: https://github.com/cocos2d/cocos2d-x.git
+- Code language: C++
+- Code license: MIT
+
+## Building
+
+- Build system: CMake
+