Update documentation

docs/feature_unicode.md

@@ -100,18 +100,20 @@ You can also set the input method via `set_unicode_input_mode(x)`, and this func
 
 ?> Keep in mind that both methods write to EEPROM, and are loaded each time the keyboard starts. So you only need to hit this once.
 
+!> There are options for BSD, but it is not actually supported at this time. If you use BSD and want support for this, please [open an issue on GitHub](https://github.com/qmk/qmk_firmware/issues)
+
 ### Audio Feedback for Input Mode keycodes
 
 If you have the [Audio feature](feature_audio.md) enabled on the board, you can set "songs" for them to play when pressed, so you have some audio feedback when switching modes.
 
 For instance, you can add these to your `config.h` file.
 
 ```c
+#define UNICODE_SONG_OSX COIN_SOUND
 #define UNICODE_SONG_LNX  UNICODE_LINUX
-#define UNICODE_WINDOWS_SONG UNICODE_WINDOWS
-#define UNICODE_WIN_COMPOSE_SONG UNICODE_WINDOWS
-#define UNICODE_OSX_SONG COIN_SOUND
-#define UNICODE_OSX_RALT_SONGCOIN_SOUND
+#define UNICODE_SONG_WINDOWS UNICODE_WINDOWS
+#define UNICODE_SONG_WIN_COMPOSE UNICODE_WINDOWS
+#define UNICODE_SONG_OSX_RALT COIN_SOUND
 ```
 
 ### Unicode Input Method Customization