[Logstash] Publish lost clarification for ssl_certificate_authorities

[rseldner]

This logstash asciidoc PR merged last year, but I'm not spotting any doc pages where that actually landed.
It seems like that change got lost somehow?  I can see the change in the source file
https://github.com/logstash-plugins/logstash-output-http/blob/a59fad7c4d94a902508d69acdf7d090594ed1941/docs/index.asciidoc?plain=1#L348-L356
but not in the published 8.x docs.
https://www.elastic.co/guide/en/logstash/8.19/plugins-outputs-http.html?edit#plugins-outputs-http-ssl_certificate_authorities

===== `ssl_certificate_authorities`

  * Value type is a list of <<path,path>>
+  * This plugin does not support multiple entries
  * There is no default value for this setting

The .cer or .pem CA files to validate the server's certificate.

+NOTE: When provided with a single PEM file that contains multiple certificates, all enclosed certificates will be trusted.

It would be great to get that published to any applicable plugins with the same ssl_certificate_authorities limitation into the 8.x and current .md docs.

Examples:

• Elasticsearch Output: https://www.elastic.co/docs/reference/logstash/plugins/plugins-outputs-elasticsearch#plugins-outputs-elasticsearch-ssl_certificate_authorities
• HTTP Output: https://www.elastic.co/docs/reference/logstash/plugins/plugins-outputs-http#plugins-outputs-http-ssl_certificate_authorities

[karenzone]

WORK IN PROGRESS (@karenzone)

• PR to bump version: Version bump to v.6.0.1 to publish docs logstash-plugins/logstash-output-http#156
  • Approve and merge PR
  • Publish gems (6.x and 5.x) to rubygems.org
• Plugin docgen, review, and merge: auto generated update of versioned plugin documentation logstash-docs#2027
• Convert files to MD for publishing: https://github.com/elastic/logstash-docs-md/pull/104
• Verify: https://www.elastic.co/docs/reference/logstash/plugins/plugins-outputs-http#plugins-outputs-http-ssl_certificate_authorities

Background: https://www.elastic.co/docs/extend/logstash/plugin-doc#_wheres_my_doc

[karenzone]

Follow-up issue:

[Logstash plugins] Doc: ssl_certificate_authorities setting limited to single entry #18846