Used rdiff-backup.nongnu.org as web page

git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@711 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

trunk/rdiff-backup/rdiff-backup.1

@@ -1006,6 +1006,6 @@ Feel free to ask me questions or send me bug reports, but you may want to see th
 .BR rsync (1),
 .BR ssh (1).
 The main rdiff-backup web page is at
-.IR http://www.nongnu.org/rdiff-backup/ .
+.IR http://rdiff-backup.nongnu.org/ .
 It has more information, links to the mailing list and CVS, etc.