Using SSL for Database connections is not documented

[xoxys]

WHAT Needs to be Documented?

The documentation need to cover database connection setups over TLS.

WHERE Does This Need To Be Documented (Link)?

https://doc.owncloud.com/server/next/admin_manual/configuration/database/linux_database_configuration.html

WHY Should This Change Be Made?

In a distributed setup where the database is running on a dedicated host, connections between the ownCloud server and the database server should be secured using TLS.

(Optional) What Type Of Content Change Is This?

• [X] New Content Addition
• [ ] Old Content Deprecation
• [ ] Existing Content Simplification
• [ ] Bug Fix to Existing Content

(Optional) Which Manual Does This Relate To?

• [X] Admin Manual
• [ ] Developer Manual
• [ ] User Manual
• [ ] Android
• [ ] iOS
• [ ] Branded Clients
• [ ] Desktop Client
• [ ] Other