gfileutils: Mention g_dir_make_tmp() in g_mkdtemp*() docs
gfileutils: Mention g_dir_make_tmp() in g_mkdtemp*() docs

https://bugzilla.gnome.org/show_bug.cgi?id=777493

endlessm/glib,johne53/MB3Glib,endlessm/glib,endlessm/glib,johne53/MB3Glib,johne53/MB3Glib,johne53/MB3Glib,johne53/MB3Glib,endlessm/glib,endlessm/glib,johne53/MB3Glib