elm elm_panes.h: fixed wrong documentation about elm_panes_fixed_set/get.
elm elm_panes.h: fixed wrong documentation about elm_panes_fixed_set/get.

SVN revision: 83966

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