Added Documentation Column to system.settings Table

Why it matters

This feature was created to enhance the usability of the system.settings table by including explanatory documentation directly within the table. It solves the problem of users needing to search external resources to understand the purpose of various settings, thereby improving discoverability and ease of configuration.

How to use it

Use SELECT queries on the system.settings table to retrieve settings along with their documentation descriptions. For example:

SELECT name, value, documentation FROM <code>system.settings</code> WHERE name = 'max_memory_usage'

This allows users to see not only the setting values but also their explanations in one place.