progdocs: Fix Doxygen left-overs.

apps/app_voicemail.c

include/asterisk/cdr.h

include/asterisk/channel.h

include/asterisk/conversions.h

include/asterisk/core_local.h

include/asterisk/endpoints.h

include/asterisk/http.h

include/asterisk/image.h

include/asterisk/stasis_app_device_state.h

include/asterisk/stasis_cache_pattern.h

include/asterisk/stasis_endpoints.h

include/asterisk/stasis_internal.h

include/asterisk/threadpool.h

main/stasis_endpoints.c

res/ari/internal.h

res/parking/parking_ui.c

res/stasis_recording/stored.c

tests/test_bridging.c