Fix typo

Author: jvazquez-r7

modules/exploits/windows/http/ericom_access_now_bof.rb

@@ -15,7 +15,7 @@ def initialize(info = {})
       'Name'           => 'Ericom AccessNow Server Buffer Overflow',
       'Description'    => %q{
         This module exploits a stack based buffer overflow in Ericom AccessNow Server. The
-        vulnerability is due to an insecure usage of vsprintf with used controlled data,
+        vulnerability is due to an insecure usage of vsprintf with user controlled data,
         which can be triggered with a malformed HTTP request. This module has been tested
         successfully with Ericom AccessNow Server 2.4.0.2 on Windows XP SP3 and Windows 2003
         Server SP2.