Doxygen comment tweaks.

apps/app_queue.c

channels/chan_sip.c

main/bridge_channel.c

main/cdr.c

main/data.c

main/db.c

main/features.c

main/file.c

main/format.c

main/indications.c

main/manager.c

main/message.c

main/pbx.c

main/pickup.c

main/rtp_engine.c

main/stasis_channels.c

main/xmldoc.c

res/parking/parking_bridge_features.c

res/res_rtp_asterisk.c

tests/test_abstract_jb.c