bug#7755: 24.0.50; Document that you can apply a keyword to a menu submenu

[Lars Ingebrigtsen]

"Drew Adams" <drew.adams@oracle.com> writes:

> b. The form for a submenu is the same:
>    (menu-item ITEM-NAME REAL-BINDING . ITEM-PROPERTY-LIST)
>
>    But the REAL-BINDING description needs to be changed.  This is
>    incorrect:
>    "The third element, REAL-BINDING, is the command to execute."
>
>    REAL-BINDING can be a command or a keymap or nil.
>
> c. If REAL-BINDING is a command, then you get a selectable menu item.
>    If it is a keymap then you get a submenu.  If it is nil then you get
>    a non-selectable menu item (e.g. a separator line).

I've now documented this in Emacs 27.

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