To support the goal for docs: minimalism, remove fluff and low value content.

In depth review of the source files used for single-sourcing https://www.eclipse.org/che/docs/stable/administration-guide/advanced-configuration-options-for-the-che-server-component/

Source files:

https://github.com/eclipse-che/che-server/blob/main/assembly/assembly-wsmaster-war/src/main/webapp/WEB-INF/classes/che/che.properties

https://github.com/eclipse-che/che-server/blob/main/assembly/assembly-wsmaster-war/src/main/webapp/WEB-INF/classes/che/multiuser.properties

Scoping:

These files contain fields that are not relevant anymore, wait for engineering cleanup before reviewing.