Document the Xbox One Elite paddle buttons

include/SDL_gamecontroller.h

@@ -363,10 +363,10 @@ typedef enum
     SDL_CONTROLLER_BUTTON_DPAD_DOWN,
     SDL_CONTROLLER_BUTTON_DPAD_LEFT,
     SDL_CONTROLLER_BUTTON_DPAD_RIGHT,
-    SDL_CONTROLLER_BUTTON_AUX1,	// Xbox Elite paddle, PS4/PS5 touchpad button, Nintendo Switch Pro capture button
-    SDL_CONTROLLER_BUTTON_AUX2,	// Xbox Elite paddle
-    SDL_CONTROLLER_BUTTON_AUX3,	// Xbox Elite paddle
-    SDL_CONTROLLER_BUTTON_AUX4,	// Xbox Elite paddle
+    SDL_CONTROLLER_BUTTON_AUX1,	// Xbox Elite paddle upper left, PS4/PS5 touchpad button, Nintendo Switch Pro capture button
+    SDL_CONTROLLER_BUTTON_AUX2,	// Xbox Elite paddle upper right
+    SDL_CONTROLLER_BUTTON_AUX3,	// Xbox Elite paddle lower left
+    SDL_CONTROLLER_BUTTON_AUX4,	// Xbox Elite paddle lower right
     SDL_CONTROLLER_BUTTON_MAX
 } SDL_GameControllerButton;