Cleanup reference to config.pl so it makes sense not only in

SGML source but in the actual web/pdf viewer...

doc/src/sgml/install-win32.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/install-win32.sgml,v 1.48 2008/07/29 15:17:27 mha Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/install-win32.sgml,v 1.49 2008/07/29 15:23:44 mha Exp $ -->
 
 <chapter id="install-win32">
  <title>Installation on <productname>Windows</productname></title>
@@ -73,7 +73,7 @@
    or the free Express edition of
    <productname>Visual Studio 2005</productname>. The following additional products
    are required to build the complete package. Use the
-   <filename>config.pl</filename> to specify which directories the libraries
+   <filename>config.pl</filename> file to specify which directories the libraries
    are available in.
 
    <variablelist>