Add alternative way to run pisg on win32 to docs.

docs/pisg-doc.sgml

@@ -317,6 +317,13 @@
     </screen>
     </para>
 
+    <para>
+    Or alternatively:
+    <screen>
+    <prompt>c:\pisg&gt;</prompt> <userinput>perl pisg</userinput>
+    </screen>
+    </para>
+
     <para>
     The program will run and parse the logfiles you specified in the
     configuration file.