Merge from origin/emacs-28

23112f89f9 ; Improve documentation of 'file-name-with-extension'
4be938169d Release the desktop lock in 'kill-emacs-hook'
4ea1f6c7f8 ; * doc/lispref/tips.texi (Documentation Tips): Fix typos....

# Conflicts:
#	doc/lispref/tips.texi

diff --cc doc/lispref/tips.texi
index d03698d354f172dd56683e7357e48eff75e8508a,1b256f752a3da3b8f91ae31dd023814153823d38..9faf3f33ba880598f383054bf4bfd0fe0c0f67eb
--- 1/doc/lispref/tips.texi
--- 2/doc/lispref/tips.texi
+++ b/doc/lispref/tips.texi
@@@ -706,24 -687,26 +706,24 @@@ as these expressions can stand for them
  @cindex curly quotes
  @cindex curved quotes
  When a documentation string refers to a Lisp symbol, write it as it
 -would be printed (which usually means in lower case), surrounding it
 -with curved single quotes (@t{‘..’}).  There are two exceptions: write
 -@code{t} and @code{nil} without surrounding punctuation.  For example:
 +would be printed (which usually means in lower case), with a grave
 +accent @samp{`} before and apostrophe @samp{'} after it.  There are
 +two exceptions: write @code{t} and @code{nil} without surrounding
 +punctuation.  For example:
  
  @example
-  CODE can be `lambda', nil, or t.
 -CODE can be ‘lambda’, nil, or t.
++CODE can be `lambda', nil, or t.
  @end example
  
 -@noindent
 -@xref{Quotation Marks,,, emacs, The GNU Emacs Manual}, for how to
 -enter curved single quotes.
 -
 -Documentation strings can also use an older single-quoting convention,
 -which quotes symbols with grave accent @t{`} and apostrophe
 -@t{'}: @t{`like-this'} rather than @t{‘like-this’}.  This
 -older convention was designed for now-obsolete displays in which grave
 -accent and apostrophe were mirror images.
 -Documentation using this convention is converted to the user's
 -preferred format when it is copied into a help buffer.  @xref{Keys in
 -Documentation}.
 +Note that when Emacs displays these doc strings, Emacs will usually
 +display @samp{`} (grave accent) as @samp{‘} (left single quotation
 +mark) and @samp{'} (apostrophe) as @samp{’} (right single quotation
 +mark), if the display supports displaying these characters.
 +@xref{Keys in Documentation}.  (Some previous versions of this section
 +recommended using the non-@acronym{ASCII} single quotation marks
 +directly in doc strings, but this is now discouraged, since that leads
 +to broken help string displays on terminals that don't support
 +displaying those characters.)
  
  @cindex hyperlinks in documentation strings
  Help mode automatically creates a hyperlink when a documentation string

diff --cc lisp/desktop.el
Simple merge

diff --cc lisp/files.el
Simple merge