Add more text to clarify the behavior of 'with-current-buffer'

* doc/lispintro/emacs-lisp-intro.texi (copy-to-buffer): Expand
description of 'with-current-buffer'.  (Bug#67521)

Copyright-paperwork-exempt: yes

1 files changed, 5 insertions, 1 deletions

diff --git a/doc/lispintro/emacs-lisp-intro.texi b/doc/lispintro/emacs-lisp-intro.texi
index e4a0f585f69..ba93dfd3b91 100644
--- a/doc/lispintro/emacs-lisp-intro.texi
+++ b/doc/lispintro/emacs-lisp-intro.texi
@@ -5445,7 +5445,11 @@ That expression starts with @code{get-buffer-create buffer}.  The
 function tells the computer to use the buffer with the name specified
 as the one to which you are copying, or if such a buffer does not
 exist, to create it.  Then, the @code{with-current-buffer} function
-evaluates its body with that buffer temporarily current.
+evaluates its body with that buffer temporarily current, after which
+it will switch back to the buffer we are at now@footnote{It is like
+calling @code{(save-excursion (set-buffer ...) ...)} in one go, though
+it is defined slightly differently which interested reader can find
+out using @code{describe-function}}.
 
 (This demonstrates another way to shift the computer's attention but
 not the user's.  The @code{append-to-buffer} function showed how to do