[Docs] Kibana Logstash Pipeline Management

[richiejarvis]

Hi Team,

Checking the Logstash and Kibana guides for the Logstash Centralised Pipeline management feature (https://www.elastic.co/guide/en/logstash/current/logstash-centralized-pipeline-management.html) we see the v6 UI displayed.

Can we:

1. Place a link from the Kibana Guide to the Logstash Guide for this feature
2. Update the pictures in guide to match the current UI version

Thanks!

Cheers,

Richie