(gnus-article-toggle-truncate-lines): Don't use `iff' in docstrings.

diff --git a/lisp/gnus/gnus-art.el b/lisp/gnus/gnus-art.el
index 2658a709463e8072e5423a33a428d713b17c35e3..c6eeb1af61b3fcffc6d4e3d267b7e9b0066eed39 100644 (file)
--- a/lisp/gnus/gnus-art.el
+++ b/lisp/gnus/gnus-art.el
@@ -2232,7 +2232,7 @@ predicate.  See Info node `(gnus)Customizing Articles'."
   "Toggle whether to fold or truncate long lines in article the buffer.
 If ARG is non-nil and not a number, toggle
 `gnus-article-truncate-lines' too.  If ARG is a number, truncate
-long lines iff arg is positive."
+long lines if and only if arg is positive."
   (interactive "P")
   (cond
    ((and (numberp arg) (> arg 0))