Better documenting EINA_MAGIC_SET()'s use.
Better documenting EINA_MAGIC_SET()'s use.

Patch by Jonas Gastal.



git-svn-id: a6113611d365f0fc061992be0d1d0b451b434026@50744 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

jordemort/eina,jordemort/eina,jordemort/eina