Updated raylib platforms and graphics (markdown)

raylib-platforms-and-graphics.md

@@ -1,4 +1,4 @@
-raylib relies on OpenGL as its main graphic API. Depending on the platform, raylib uses different versions of OpenGL by default, but it's possible to configure the desired OpenGL API backend on library compilation; just select the appropriate `#define` when compiling the [rlgl](https://github.com/raysan5/raylib/blob/develop/src/rlgl.c) module.
+raylib relies on OpenGL as its main graphic API. Depending on the platform, raylib uses different versions of OpenGL by default, but it's possible to configure the desired OpenGL API backend on library compilation; just select the appropriate `#define` when compiling the [rlgl](https://github.com/raysan5/raylib/blob/master/src/rlgl.h) module.
 
 All OpenGL API calls are contained in the rlgl module. This module works as a layer to the underlying graphic API. The selected OpenGL version can be configured in this module using `#define`s at compile time.