Update docs for gtk.Action class
Update docs for gtk.Action class

Reorder the index alphabetically and add API new in GTK+ 2.16

amremam2004/pygtk,nzjrs/pygtk,GNOME/pygtk,Distrotech/pygtk,Distrotech/pygtk,amremam2004/pygtk,GNOME/pygtk,Distrotech/pygtk,nzjrs/pygtk,GNOME/pygtk,nzjrs/pygtk,amremam2004/pygtk