Document how to disable the automatic locking of the screen

Originally created by @sajolida on #15556 (Redmine)

See parent ticket.

Execute in a terminal:

gsettings org.gnome.desktop.screensaver lock-enabled false

Giving a command line option only sounds right for this kind of request.

Feature Branch: doc/15556-disable-automatic-locking

Parent Task: #15542 (closed)

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Edited by sajolida
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