Merge from origin/emacs-27

0a3731feef Make memq etc. examples more like they were
ed25282b82 Document effect of 'search-upper-case' on replacement comm...
5a5d8a8ec0 * lisp/desktop.el (desktop-save): Doc fix.  (Bug#41007)

diff --cc lisp/desktop.el
Simple merge

diff --cc lisp/replace.el
Simple merge