Update documentation in cmd/unix/reverse_bash

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=146464
https://bugs.launchpad.net/ubuntu/+source/bash/+bug/215034

modules/payloads/singles/cmd/unix/reverse_bash.rb

@@ -19,10 +19,11 @@ module MetasploitModule
       'Name'          => 'Unix Command Shell, Reverse TCP (/dev/tcp)',
       'Description'   => %q{
         Creates an interactive shell via bash's builtin /dev/tcp.
-        This will not work on most Debian-based Linux distributions
-        (including Ubuntu) because they compile bash without the
-        /dev/tcp feature.
-        },
+
+        This will not work on circa 2009 and older Debian-based Linux
+        distributions (including Ubuntu) because they compile bash
+        without the /dev/tcp feature.
+      },
       'Author'        => 'hdm',
       'License'       => MSF_LICENSE,
       'Platform'      => 'unix',