Describe the bug: The server.cors settings () are missing from the Kibana documentation (for multiple versions: 6.2, 6.7, 7.2) even though they are referenced in this discussion topic and GitHub issues (kibana/#17574 and kibana/#16714).

Steps to reproduce:

1. Go to the 'configuring kibana' page
2. Search for server.cors
3. No results found

Expected behavior: If the server.cors settings are configurable in Kibana, they should be part of the documentation.