Add a note to the docs about how to use this in the context of changeable

Add a note to the docs about how to use this in the context of changeable

Sat Mar  2 20:39:38 2002  Owen Taylor  <otaylor@redhat.com>

        * gtk/gtkimagemenuitem.c (gtk_image_menu_item_new_from_stock):
        Add a note to the docs about how to use this in the
        context of changeable accelerators. (#72382, Mark Patton)