Typo in Emacs 29 manual?

[Natalie]

I'm not filing a bug about this (yet), because I think I might be
missing something. But can someone tell me if this is a typo?

>From 30.1 Entering Dired (pulled from git master's emacs.info)
> Typing ‘C-x C-j’ (‘dired-jump’) in any buffer will open a Dired buffer and 
> move point to the line corresponding to the current file. In Dired, move up a 
> level and go to the previous directory’s line.  Typing ‘C-x 4 C-j’ 
> (‘dired-jump-other-window’ has the same effect but opens a new window for the 
> Dired buffer.

"In Dired, move up a level and go to the previous directory's line" is
the part I'm talking about. What does this mean? It seems like a
keybinding might be missing here, like: move up a level and go to the
previous directory's line by pressing FOO.

-Natalie