cmd-run: Document --ssh-port and fix help string
Include `--ssh-port` in the help output. Also, we don't default to port
2222 so drop that bit. In fact, we don't port forward at all by default,
so reword the whole sentence to reflect this.
@@ -35,7 +35,7 @@ Options:
--srv src Mount (via 9p) src on the host as /var/srv in guest
-m MB RAM size in MB (2048)
--size GB Disk size in GB (matches base by default)
- -p PORT The port on localhost to map to the VM's sshd. [2222]
+ -p --ssh-port PORT Map PORT on localhost to the VM's sshd.
-h this ;-)
-B --boot-inject Force Ignition injection into /boot (useful for running metal images)
--uefi Boot using uefi (x86_64 only, implied on arm)
