🧹 update opcua subcommand help

[chris-rock]

cnquery shell opcua --endpoint opc.tcp://localhost:50000
→ loaded configuration from /Users/chris/.config/mondoo/mondoo.yml using source default
→ connected to OPC UA
  ___ _ __   __ _ _   _  ___ _ __ _   _ 
 / __| '_ \ / _` | | | |/ _ \ '__| | | |
| (__| | | | (_| | |_| |  __/ |  | |_| |
 \___|_| |_|\__, |\__,_|\___|_|   \__, |
  mondoo™      |_|                |___/  interactive shell

cnquery> googleworkspace.user
cnquery> opcua.root
opcua.root: opcua.node id="i=84" name="Root"
cnquery> opcua.root { * }
opcua.root: {
  id: "i=84"
  dataType: ""
  description: ""
  max: ""
  properties: []
  namespace: opcua.namespace id = opcua.namespace/0
  min: ""
  components: []
  writeable: false
  name: "Root"
  organizes: [
    0: opcua.node id="i=85" name="Objects"
    1: opcua.node id="i=86" name="Types"
    2: opcua.node id="i=87" name="Views"
  ]
  class: "NodeClassObject"
  unit: ""
  accessLevel: "AccessLevelTypeNone"
}