[Config] Document 'log' configuration settings

[andreyaksenov]

Product: Tarantool
Since: 3.0
Root document:

• A new log section in the Configuration reference.
• Logs.
• Module log.

SME: @ Totktonada

Details

Options:

• https://github.com/tarantool/tarantool/blob/f58bfc97c627f1838696697339fb3e443c05767a/src/box/lua/config/instance_config.lua#L735

Related topics:

• https://www.tarantool.io/en/doc/latest/reference/configuration/#logging (in a new topic, Logging example can be converted to a runnable sample that shows how to configure logging)