elm elm_gen_common.h: Use proper doxygen keywords.
elm elm_gen_common.h: Use proper doxygen keywords.

Signed-off-by: Daniel Juyung Seo <juyung.seo@samsung.com>

SVN revision: 68804

FlorentRevest/Elementary,tasn/elementary,rvandegrift/elementary,tasn/elementary,FlorentRevest/Elementary,tasn/elementary,FlorentRevest/Elementary,FlorentRevest/Elementary,tasn/elementary,rvandegrift/elementary,rvandegrift/elementary,rvandegrift/elementary,tasn/elementary