use ruby syntax

How-to-write-a-browser-exploit-using-BrowserExploitServer.md

@@ -168,7 +168,7 @@ The BrowserExploitServer mixin also offers plenty of other things useful while c
 
 To get thing started, here's a code example you can use start developing your browser exploit:
 
-```
+```ruby
 ##
 # This module requires Metasploit: http//metasploit.com/download
 # Current source: https://github.com/rapid7/metasploit-framework