Documentation cleanup

alsa-project/alsa-lib pull request #340 was opened from borine:

Fixes missing doxygen tags and macros so that now doxygen picks up all of the documentation comments and completes cleanly without any errors or warnings.

Request URL : https://github.com/alsa-project/alsa-lib/pull/340 Patch URL : https://github.com/alsa-project/alsa-lib/pull/340.patch Repository URL: https://github.com/alsa-project/alsa-lib