fix a broken link

Author: Brent Cook

modules/exploits/windows/local/razer_zwopenprocess.rb

@@ -1,5 +1,5 @@
 ##
-# This module requires Metasploit: http//metasploit.com/download
+# This module requires Metasploit: http://metasploit.com/download
 # Current source: https://github.com/rapid7/metasploit-framework
 ##