SDL_mixer: SDL_mixer.h: document Mix_StartTrack and Mix_GetNumTracks properly.

From eaf321be99e8dd196b4bdfc57b161d4462392f8f Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Thu, 30 Nov 2023 23:00:10 +0300
Subject: [PATCH] SDL_mixer.h: document Mix_StartTrack and Mix_GetNumTracks
 properly.

---
 include/SDL_mixer.h | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/include/SDL_mixer.h b/include/SDL_mixer.h
index 08b456ab..a6af01c1 100644
--- a/include/SDL_mixer.h
+++ b/include/SDL_mixer.h
@@ -2421,8 +2421,30 @@ extern DECLSPEC int SDLCALL Mix_PausedMusic(void);
  */
 extern DECLSPEC int SDLCALL Mix_ModMusicJumpToOrder(int order);
 
-/* Tracks */
+/**
+ * Start a track in music object.
+ *
+ * This only applies to GME music formats.
+ *
+ * \param music the music object.
+ * \param track the track number to play. 0 is the first track.
+ * \returns 0 if successful, or -1 if failed or isn't implemented.
+ *
+ * \since This function is available since SDL_mixer 2.8.0.
+ */
 extern DECLSPEC int SDLCALL Mix_StartTrack(Mix_Music *music, int track);
+
+/**
+ * Get number of tracks in music object.
+ *
+ * This only applies to GME music formats.
+ *
+ * \param music the music object.
+ * \returns number of tracks if successful, or -1 if failed or isn't
+ *          implemented.
+ *
+ * \since This function is available since SDL_mixer 2.8.0.
+ */
 extern DECLSPEC int SDLCALL Mix_GetNumTracks(Mix_Music *music);
 
 /**