Land rapid7#4607, proxy chains description

Author: firefart

features/modules/exploit/smb/ms08_067_netapi.feature

@@ -99,7 +99,7 @@ Feature: MS08-067 netapi
 
          Name           : Proxies
          Current Setting:
-         Description    : Use a proxy chain
+         Description    : A proxy chain of format type:host:port[,type:host:port][...]
 
          Name           : SMB::ChunkSize
          Current Setting: 500