Update docker.md

documentation/docs/admin/settings/docker.md

@@ -9,3 +9,8 @@ This feature is still experimental and not yet released.
 :::
 
 ![openadmin docker settings](/img/admin/adminpanel_docker_settings.png)
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+To download Docker images, click the "update images" button.
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+To remove an unnecessary image, click the delete button next to the image and confirm your action in the pop-up modal.