Update supported WMS versions

See MapServer/MapServer#7337

Author: geographika

en/ogc/wms_server.txt

@@ -26,8 +26,7 @@ Map Server Interfaces Implementation Specification v1.1.1`_.
 
 MapServer v3.5 or more recent is required to implement WMS
 features. At the time this document was written, MapServer supports
-the following WMS versions: 1.0.0, 1.0.7, 1.1.0 (a.k.a. 1.0.8), 1.1.1
-and 1.3.0.
+the following WMS versions: 1.0.0, 1.1.0, 1.1.1 and 1.3.0.
 
 This document assumes that you are already familiar with certain
 aspects of MapServer: