gamecontroller: Added docs to SDL_GameControllerBindType, to fix wiki docs.

include/SDL_gamecontroller.h

@@ -79,6 +79,19 @@ typedef enum SDL_GameControllerType
     SDL_CONTROLLER_TYPE_MAX
 } SDL_GameControllerType;
 
+/**
+ * Types of game controller control bindings.
+ *
+ * A game controller is a collection of bindings that map arbitrary joystick
+ * buttons, axes and hat switches to specific positions on a generic
+ * console-style gamepad.
+ *
+ * \since This enum is available since SDL 2.0.0.
+ *
+ * \sa SDL_GameControllerButtonBind
+ * \sa SDL_GameControllerGetBindForAxis
+ * \sa SDL_GameControllerGetBindForButton
+ */
 typedef enum SDL_GameControllerBindType
 {
     SDL_CONTROLLER_BINDTYPE_NONE = 0,