Improve text-quoting-style doc again

* doc/lispref/help.texi (Keys in Documentation):
Omit overkill discussion of ‘setq’.  Mention Emacs versions
where ‘grave’ style was standard.

1 files changed, 3 insertions, 4 deletions

diff --git a/doc/lispref/help.texi b/doc/lispref/help.texi
index 0e08b2a2bfc..685995b395f 100644
--- a/doc/lispref/help.texi
+++ b/doc/lispref/help.texi
@@ -358,11 +358,10 @@ If the variable's value is @code{curve}, the style is
 @t{‘like this’} with curved single quotes.  If the value is
 @code{straight}, the style is @t{'like this'} with straight
 apostrophes.  If the value is @code{grave}, the style is @t{`like
-this'} with grave accent and apostrophe.  The default value @code{nil}
+this'} with grave accent and apostrophe, the standard style
+before Emacs version 25.  The default value @code{nil}
 acts like @code{curve} if curved single quotes are displayable, and
-like @code{grave} otherwise.  To use the traditional @code{grave}
-style, put the line @code{(setq text-quoting-style 'grave)} into your
-@file{~/.emacs} file.
+like @code{grave} otherwise.
 @end defvar
 
 @defun substitute-command-keys string