bug#4393: 23.1; doc string of accessible-keymaps

[Drew Adams]

> > (accessible-keymaps (current-global-map))
> [...]
> > Search for [f2] in the result sexp. You'll find this:
> > ([f2] . t). That's one of the entries in the alist returned by
> > `accessible-keymaps'.
> > There are two other entries with cdr = t: ([24 11] . t) and
> > ([24 54] . t). All the other entries have a keymap as cdr.
>  
> It turns out that these are prefixes bound to autoloaded keymaps that
> haven't yet been loaded (and they also happen to be the same keymap).
> `accessible-keymaps' does not autoload keymaps.  I guess it should
> return ([f2] . 2C-command) and  ([24 54] . 2C-command).

OK, so if I understand right, this is not a lack of explanation in the doc of
accessible-keymaps, but is a code bug that will be fixed.