bug#44611: Prefix arg for xref-goto-xref

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Date: Fri, 11 Dec 2020 11:30:25 +0200
> Cc: 44611@debbugs.gnu.org
> 
> +(defun xref-pop-marker-stack (&optional kill)
> +  "Pop back to where \\[xref-find-definitions] was last invoked.
> +With prefix argument KILL non-nil, kill the previous buffer instead of
> +burying it."

What is "the previous buffer" in this context?  The doc string leaves
that unexplained, and thus may confuse the reader.

(I don't object to such a feature, but I really don't understand the
urge to kill Emacs buffers just because they were needed temporarily.
Why is that important?)