Doc: Lots and lots of doxymentation fixes

src/music/midifile.cpp

@@ -520,8 +520,8 @@ struct MpsMachine {
 
 	/**
 	 * Construct a TTD DOS music format decoder.
-	 * @param songdata Buffer of song data from CAT file, ownership remains with caller
-	 * @param songdatalen Length of the data buffer in bytes
+	 * @param data Buffer of song data from CAT file, ownership remains with caller
+	 * @param length Length of the data buffer in bytes
 	 * @param target MidiFile object to add decoded data to
 	 */
 	MpsMachine(const byte *data, size_t length, MidiFile &target)

src/music/music_driver.hpp

@@ -21,7 +21,7 @@ class MusicDriver : public Driver {
 public:
 	/**
 	 * Play a particular song.
-	 * @param filename The name of file with the song to play.
+	 * @param song The information for the song to play.
 	 */
 	virtual void PlaySong(const MusicSongInfo &song) = 0;