update for 8.6.4 release

Author: jmckenna

en/introduction.txt

@@ -10,7 +10,7 @@ An Introduction to MapServer
 :Contact: david.fawcett at moea.state.mn.us
 :Author: Howard Butler
 :Contact: hobu.inc at gmail.com
-:Last Updated: 2026-06-01
+:Last Updated: 2026-06-02
 
 .. contents::
     :depth: 3

en/mapfile/layer.txt

@@ -128,7 +128,7 @@ CONNECTION [string]
     .. WARNING::
        MapServer's native SDE driver was removed for the MapServer 7.0 release 
        (see `discussion <https://lists.osgeo.org/pipermail/mapserver-dev/2015-February/014349.html>`__).
-       GDAL's OGR SDE driver was removed in the GDAL 3.2.0 release.    
+       GDAL's SDE driver was removed in the GDAL `3.2.0 release <https://github.com/OSGeo/gdal/blob/v3.2.0/gdal/NEWS>`__.    
 
     .. seealso::