Add documentation links to advanced option descriptions

[taylor-swanson]

Many of our integrations include configuration options to provide advanced settings for TCP, UDP inputs, SSL, etc. These are free-form fields and the user will need to know ahead of time what to provide. We should provide a link to the corresponding documentation that describes what fields may be provided. A few of our integrations already do this (PANW, for example), but many others are missing this documentation (Fortigate, for example).

Example of Custom TCP Options lacking a documentation link (Fortigate):

Example of Custom TCP Options with a documentation link (PANW):

This issue should apply to all integrations that allow providing custom options for inputs or other configuration areas. This includes, but is not limited to:

• Custom TCP Options (Usually found on TCP inputs)
• Custom UDP Options (Usually found on UDP inputs)
• SSL Options (Usually found on TCP inputs, but may be used elsewhere)

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[botelastic[bot]]

Hi! We just realized that we haven't looked into this issue in a while. We're sorry! We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1. Thank you for your contribution!