Update CLI introduction, invalid syntax

[troglobit]

Current Behavior

admin@infix-14-ff-ff:/> help introduction
      .
      .
      .
      | admin@host-12-34-56:/> show interfaces brief
      | lo               UNKNOWN        00:00:00:00:00:00 <LOOPBACK,UP,LOWER_UP>
      | eth0             UP             52:54:00:12:34:56 <BROADCAST,MULTICAST,UP,LOWER_UP>
      | admin@host-12-34-56:/> show ip brief
      | lo               UNKNOWN        127.0.0.1/8 ::1/128
      | eth0             UP             192.168.2.200/24 fe80::5054:ff:fe12:3456/64
      | admin@host-12-34-56:/> copy running-config startup-config

    One of the ideas behind a separate running and startup configuration
    is to be able to verify a configuration change. In case of an
    inadvertent change that, e.g., breaks networking, it is trivial to
    revert back by:

      | admin@host-12-34-56:/> copy startup-config running-config

    Or restarting the device.


admin@infix-14-ff-ff:/> show interfaces brief
Error: Command not found, or incomplete.  Try ? for help or Tab for completion.

Expected Behavior

There may be value to a brief argument to show interfaces, but most likely we want to update the CLI introduction (and other documentation) to match.

Steps To Reproduce

No response

Additional information

No response