res_ari: Fix for Doxygen.

include/asterisk/ari.h

res/ari/ari_model_validators.h

res/ari/resource_bridges.c

res/ari/resource_channels.c

res/ari/resource_events.h

res/res_ari.c

res/res_ari_applications.c

res/res_ari_asterisk.c

res/res_ari_bridges.c

res/res_ari_channels.c

res/res_ari_device_states.c

res/res_ari_endpoints.c

res/res_ari_events.c

res/res_ari_mailboxes.c

res/res_ari_playbacks.c

res/res_ari_recordings.c

res/res_ari_sounds.c

rest-api-templates/ari_model_validators.h.mustache

rest-api-templates/ari_resource.h.mustache

rest-api-templates/res_ari_resource.c.mustache