[DOC] add a reminder about obsolete documents

haproxy-en.txt and haproxy-fr.txt are outdated but people still refer to
them quite often, generally causing a useless waste of time.
diff --git a/doc/haproxy-en.txt b/doc/haproxy-en.txt
index de40f10..c63f89e 100644
--- a/doc/haproxy-en.txt
+++ b/doc/haproxy-en.txt
@@ -6,6 +6,15 @@
                               willy tarreau
                                 2008/04/19
 
+
+ !!!!  NOTE: THIS DOCUMENT IS OUTDATED  !!!!
+
+ Please use "configuration.txt" from the same directory, or download
+ an up-to-date version from the following location :
+
+        http://haproxy.1wt.eu/download/1.3/doc/configuration.txt
+
+
 ============
 | Abstract |
 ============
diff --git a/doc/haproxy-fr.txt b/doc/haproxy-fr.txt
index a70e3c5..427d28b 100644
--- a/doc/haproxy-fr.txt
+++ b/doc/haproxy-fr.txt
@@ -6,6 +6,15 @@
                               willy tarreau
                                 2006/09/03
 
+
+ !!!!  NOTE: CE DOCUMENT EST PERIME  !!!!
+
+ Veuillez utiliser le fichier "configuration.txt" situé dans le même
+ répertoire, ou télécharger une version à jour à l'emplacement ci-dessous :
+
+        http://haproxy.1wt.eu/download/1.3/doc/configuration.txt
+
+
 ================
 | Introduction |
 ================