[Security Integrations] Ensure that all 'ssl' configuration options have descriptions

[andrewkroh]

Anywhere that we have an SSL configuration option (YAML text area) it must have a description. The description must link to reference docs that explain all of the possible settings. Ideally all of the descriptions would be exactly the same unless there is some context specific information.

We need to assess which integrations are missing a description for the ssl variable and then open a PR to add one.

Related issues

• [Change Proposal] Add special tls variable types package-spec#761 (this would not be needed if we have a SSL settings UI component)

[elasticmachine]

Pinging @elastic/security-service-integrations (Team:Security-Service Integrations)