Add <> for tubes, fix typo


```python
from pwn import *
shell  = ssh(host='vortex.labs.overthewire.org',user='vortex1',password='Gq#qu3bF3')
bash   = shell.shell()
client = listen(1337)
client <> bash
```

```shell
$ nc localhost 1337
vortex1@melinda:~$ 
```