[PATCH] Improve ido-use-filename-at-point docstring

[Robert Pluim]

Here's a small doc fix I appear to have forgotten about:

>From 458f4ef236027abf47b4ed1b7442dffc0eb766a6 Mon Sep 17 00:00:00 2001
From: Robert Pluim <address@hidden>
Date: Tue, 15 Nov 2016 14:37:00 +0100
Subject: [PATCH] Document that `guess' is an allowed value

* ido.el (ido-use-filename-at-point): Document `guess' value better
---
 lisp/ido.el | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lisp/ido.el b/lisp/ido.el
index da0c9d463d..4a68107397 100644
--- a/lisp/ido.el
+++ b/lisp/ido.el
@@ -587,11 +587,12 @@ ido-work-directory-list-ignore-regexps
 
 (defcustom ido-use-filename-at-point nil
   "Non-nil means that Ido shall look for a filename at point.
-May use `ffap-guesser' to guess whether text at point is a filename.
-If found, use that as the starting point for filename selection."
+`guess' means use`ffap-guesser' to guess whether text at point is
+a filename.  If found, use that as the starting point for
+filename selection."
   :type '(choice
          (const :tag "Disabled" nil)
-         (const :tag "Guess filename" guess)
+         (const :tag "Guess filename using ffap-guesser" guess)
          (other :tag "Use literal filename" t))
   :group 'ido)
 
-- 
2.16.1.72.g5be1f00a9