Fixed comment for the new Steam Controller mapping

Fixes https://github.com/libsdl-org/SDL/issues/14465

src/joystick/SDL_gamepad.c

@@ -1254,7 +1254,7 @@ static GamepadMapping_t *SDL_CreateMappingForHIDAPIGamepad(SDL_GUID guid)
             // Steam controllers have 2 back paddle buttons
             SDL_strlcat(mapping_string, "paddle1:b11,paddle2:b12,", sizeof(mapping_string));
         } else if (SDL_IsJoystickSteamTriton(vendor, product)) {
-            // Steam controllers have 2 back paddle buttons
+            // Second generation Steam controllers have 4 back paddle buttons
             SDL_strlcat(mapping_string, "misc1:b11,paddle1:b12,paddle2:b13,paddle3:b14,paddle4:b15", sizeof(mapping_string));
         } else if (SDL_IsJoystickNintendoSwitchPro(vendor, product) ||
                    SDL_IsJoystickNintendoSwitchProInputOnly(vendor, product)) {