Fixed incorrect parcel-descriptor.xml

Added some brief documentation on purpose of macro

scripting/examples/javascript/ExportSheetsToHTML/exportsheetstohtml.js

+// When this script is run on an existing, saved, spreadsheet, 
+// eg. /home/testuser/myspreadsheet.sxc, the script will export
+// each sheet to a separate html file, 
+// eg. /home/testuser/myspreadsheet_sheet1.html, 
+// /home/testuser/myspreadsheet_sheet2.html etc
 importClass(Packages.com.sun.star.uno.UnoRuntime);
 importClass(Packages.com.sun.star.sheet.XSpreadsheetDocument);
 importClass(Packages.com.sun.star.container.XIndexAccess);

scripting/examples/javascript/ExportSheetsToHTML/parcel-descriptor.xml

@@ -9,7 +9,7 @@
                 Saves each sheet in the current Calc document as a separate HTML file in the same directory as the original Calc document.
             </description>
         </locale>
-        <functionname value="ExportSheetsToHTML.js"/>
+        <functionname value="exportsheetstohtml.js"/>
         <logicalname value="ExportSheetsToHTML.JavaScript"/>
     </script>