[MNGSITE-393] remove Maven 1 and 2 info (#30)

Author: elharo

src/site/apt/examples/sitedescriptor.apt

@@ -37,10 +37,6 @@ Configuring the Site Descriptor
   to be accessible in the generated site, you must configure your site descriptor. You create the site descriptor in
   a file called <<<site.xml>>> which should be located in your <<<src/site>>> directory.
 
-  If you are migrating from Maven 1.x you will be interested to know that the
-  <<<navigation.xml>>> file has been replaced by the site descriptor in Maven 2.
-  The format is nearly the same, so you can probably reuse most of your old file.
-
   There is a
   {{{/doxia/doxia-sitetools/doxia-decoration-model/decoration.html}reference documentation for the site descriptor}}
   available with its XML Schema.