Small typo fixed

modules/exploits/multi/http/rails_web_console_v2_code_exec.rb

@@ -16,7 +16,7 @@ class MetasploitModule < Msf::Exploit::Remote
       'Description'    => %q{
           This module exploits an IP whitelist bypass vulnerability in the developer
         web console included with Ruby on Rails 4.0.x and 4.1.x. This module will also
-        achieved code execution on Rails 4.2.x if the attack is launched from a
+        achieve code execution on Rails 4.2.x if the attack is launched from a
         whitelisted IP range.
       },
       'Author'         => [