main: Fix for Doxygen.

include/asterisk/_private.h

include/asterisk/acl.h

include/asterisk/alertpipe.h

include/asterisk/astobj2.h

include/asterisk/autochan.h

include/asterisk/backtrace.h

include/asterisk/bridge.h

include/asterisk/bridge_after.h

include/asterisk/bridge_basic.h

include/asterisk/bridge_channel_internal.h

include/asterisk/bridge_features.h

include/asterisk/bridge_internal.h

include/asterisk/bridge_roles.h

include/asterisk/bucket.h

include/asterisk/callerid.h

include/asterisk/ccss.h

include/asterisk/cdr.h

include/asterisk/cli.h

include/asterisk/config.h

include/asterisk/config_options.h