update links

Author: jmckenna

en/development/editing/vim.txt

@@ -8,7 +8,7 @@
 :Contact:       andreas.hirner at dlr.de
 :Author:        Schuyler Erle
 :Contact:       schuyler at tridity.org
-:Last Updated: 2006/5/5
+:Last Updated:  2006-05-05
 
 .. contents:: Table of Contents
     :depth: 2
@@ -54,11 +54,10 @@ Folding
 Introduction
 ------------
 
-`Vim code folding <http://www.vim.org/htmldoc/usr_28.html>`__ can be an
+`Vim code folding <https://vimhelp.org/usr_28.txt.html#usr_28.txt>`__ can be an
 extremely handy way to simplify the task of editing complex MapServer mapfiles
 inside the Vim editor. A Vim command file called `map_fold.vim`_ is attached
-to this document, which defines a folding mode for mapfiles. This file also
-lives at http://iconocla.st/code/dot/map_fold.vim.
+to this document, which defines a folding mode for mapfiles.
 
 Installation
 ------------