@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