Documentation contains screenshot of menu with irregular spacing

The screenshot of the ~~status menu~~ ~~GNOME User menu~~ ~~system menu~~ whatever you wanna call it, shows the menu as affected by #15377 (closed). The screenshot should be updated.

Feature Branch: doc/15413-screen-locker-spacing

Related issues

Blocks #14758 (closed)

Original created by @segfault on 15413 (Redmine)

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