For AtomError, this should fix a clang warning; in the other cases it's
just good documentation.
Signed-off-by: Jamey Sharp <jamey@minilop.net>
Cc: Jeremy Huddleston <jeremyhu@apple.com>
Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com>
Signed-off-by: Keith Packard <keithp@keithp.com>