ECS Audit Logging Settings 7.11 doc page changes missed other branches

[nerophon]

Kibana version: 7.11

Describe the bug:
https://www.elastic.co/guide/en/kibana/current/security-settings-kb.html#ecs-audit-logging-settings
This page shows the following correct example:

xpack.security.audit.appender:
  kind: rolling-file
  path: ./audit.log
  policy:
    kind: time-interval
    interval: 24h 
  strategy:
    kind: numeric
    max: 10 
  layout:
    kind: json

However, the same page on the wider branches is incorrect:

xpack.security.audit.appender:
  type: rolling-file
  fileName: ./audit.log
  policy:
    type: time-interval
    interval: 24h 
  strategy:
    type: numeric
    max: 10 
  layout:
    type: json

Pages affected:
https://www.elastic.co/guide/en/kibana/master/security-settings-kb.html#ecs-audit-logging-settings
https://www.elastic.co/guide/en/kibana/7.x/security-settings-kb.html#ecs-audit-logging-settings
https://www.elastic.co/guide/en/kibana/7.12/security-settings-kb.html#ecs-audit-logging-settings

This bug was noticed because there is a direct link into the 7.x branch via the ECS section (search "ECS" on the page) of:
https://www.elastic.co/blog/whats-new-kibana-7-11-0-alerting-generally-available

[elasticmachine]

Pinging @elastic/kibana-security (Team:Security)

[jportner]

These keys were intentionally changed starting in 7.12 via #90764.
The docs in 7.11 are correct.
The docs in 7.12+ have been updated to reflect the new keys (type, fileName), but the old keys (kind, path) will continue to work.