elm elm_bubble.h: Added documentation for bubble widget.
elm elm_bubble.h: Added documentation for bubble widget.

SVN revision: 78310

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