Make the value nil in text-quoting-style mean what it does in Emacs 25.

This is a partial reversion of yesterday's commit by the same author, which
changed the meaning of nil and introduced the new value t.

* src/doc.c (text_quoting_style, text-quoting-style)
(internal--text-quoting-flag): Revert yesterday's changes.

* lisp/cus-start.el: (top level): Amend the entry for text-quoting-style.

* etc/NEWS: Amend the entry for text-quoting-style.

* doc/lispref/control.texi (Signalling Errors)
* doc/lispref/display.texi (Displaying Messages)
* doc/lispref/strings.texi (Formatting Strings): Bind text-quoting-style to
grave rather than nil to inhibit translation of quotes.

* doc/lispref/help.texi (Keys in Documentation): Revert the description of the
proposed new default, t.

1 files changed, 1 insertions, 1 deletions

diff --git a/doc/lispref/control.texi b/doc/lispref/control.texi
index 09435f57966..c39e035459e 100644
--- a/doc/lispref/control.texi
+++ b/doc/lispref/control.texi
@@ -1109,7 +1109,7 @@ quotes.  In contrast, a call using a format like @t{"Missing '%s'"}
 with only apostrophes typically generates a message like @t{"Missing
 ’foo’"} with only closing curved quotes, an unusual style in English.
 One way around this problem is to bind @code{text-quoting-style} to
-@code{nil} around the call to @code{error}; this causes the
+the symbol @code{grave} around the call to @code{error}; this causes
 @acronym{ASCII} quote characters to be output unchanged.
 
 @strong{Warning:} If you want to use your own string as an error message