Fix typo in description

Running on fumes here...

Author: wvu

modules/auxiliary/scanner/http/apache_mod_cgi_bash_env.rb

@@ -20,7 +20,7 @@ def initialize(info = {})
         the HTTP_USER_AGENT variable.
 
         PROTIP: Use exploit/multi/handler with a PAYLOAD appropriate to your
-        CMD, set ExitOnSession to false, run -j, and and then run this module.
+        CMD, set ExitOnSession to false, run -j, and then run this module.
       },
       'Author' => [
         'Stephane Chazelas', # Vulnerability discovery