Land rapid7#5031, fix ms10_104_sharepoint description

Author: kernelsmith

modules/exploits/windows/misc/ms10_104_sharepoint.rb

@@ -22,7 +22,7 @@ def initialize
         request to the Office Document Conversions Launcher Service, which results in code
         execution under the context of 'SYSTEM'.
 
-        The module uses uses the Windows Management Instrumentation service to execute an
+        The module uses the Windows Management Instrumentation service to execute an
         arbitrary payload on vulnerable installations of SharePoint on Windows 2003 Servers.
         It has been successfully tested on Office SharePoint Server 2007 SP2 over Windows
         2003 SP2.