control: Add documentation for snd_ctl_card_* and friends.
In this patch series, I added a description about control interface
handling and how control interfaces are identified.
In addition, I added/improved Doxygen documentation for the
snd_ctl_card_info_t type and related corresponding functions,
e.g. snd_ctl_card_info(). I also documented other card-related like
snd_card_next().
Along the way I did minor documentation improvements.
git://git.alsa-project.org / alsa-lib.git / commit