Re: advertised-widget-backward

[Richard M. Stallman]

I don't remember for certain, but it looks like the sort of thing I do
to control which key some help features will report for that command.

This is meant to be like C-x u (advertised-undo) and C-_ (undo).
If you put \\[advertised-undo] in a doc string, it is guaranteed
to come out as C-x u, not C-_.  If they were both bound to `undo',
then either one might come out.