Document insert-directory-program as a user option

* doc/lispref/files.texi (Contents of Directories): Document
'insert-directory-program' as a user option.

(cherry picked from commit 3c820cd2650a3126ac13fc4825147271285da519)

diff --git a/doc/lispref/files.texi b/doc/lispref/files.texi
index 297baa82a4b54c47a936a45eb1fb94f46f9da2ae..a63942ce50c709b700577483a04d1ae4a8c142ea 100644 (file)
--- a/doc/lispref/files.texi
+++ b/doc/lispref/files.texi
@@ -3239,11 +3239,11 @@ for the sake of dired.  However, the normally equivalent short
 as any other option.
 @end defun
 
-@defvar insert-directory-program
-This variable's value is the program to run to generate a directory listing
-for the function @code{insert-directory}.  It is ignored on systems
-which generate the listing with Lisp code.
-@end defvar
+@defopt insert-directory-program
+This user option specifies the program to run to generate a directory
+listing for the function @code{insert-directory}.  It is ignored on
+systems that generate the listing with Lisp code.
+@end defopt
 
 @node Create/Delete Dirs
 @section Creating, Copying and Deleting Directories