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

[Eli Zaretskii]

> From: Drew Adams <drew.adams@oracle.com>
> Date: Sat, 11 Mar 2023 17:58:10 +0000
> 
> 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.

Closing.