Update HomePage.pod6

removed commented out `html` referring to core modules that includes a  link to a non-existent file

Author: finanalyst

doc/HomePage.pod6

@@ -40,13 +40,6 @@ by reporting mistakes or sending patches.
     source code.
 </dd>
 
-<!--
-<dt><a href="/module.html">Module Reference</a></dt>
-<dd>
-    Index of modules that are part of the official core distribution.
-</dd>
--->
-
 </dl>
 
 <hr/>