bug#62126: 26.3; Doc of `dired-do(-async)-shell-command': mention `dired-guess-shell-command'

[Drew Adams]

> > > It would help if the doc of these commands (and others that use
> > > `dired-read-shell-command') mentioned that if `dired-x' is loaded then
> > > they make use of option `dired-guess-shell-command' to guess an
> > > appropriate default value (command).
> >
> > It already does, in Emacs 27 and later.

Thanks; I missed that.

> Actually, I see that in Emacs 26.3 as well, so I'm not sure why you
> didn't.  Maybe you didn't mention all the commands you had in mind?

Where do you see it in 26.3?  I didn't find it there.
I don't see it there in either of those doc strings.
I don't see it in the Emacs manual, where those
commands are doc'd (or anywhere else).  I don't see
it in the Elisp manual.  But I haven't had any coffee
yet this morning...