admin-settings: add note regarding KinD + ECI config. (#22435)

<!--Delete sections as needed -->

## Description

In the admin-settings docs, in the section that describes settings for
Docker Desktop Kubernetes, add a note indicating that if a custom
repository is used for Kubernetes node images, and if Enhanced Container
Isolation (ECI) is enabled, the custom repository images must also be
added to the ECI Docker Socket image list setting.

## Related issues or tickets

https://docker.atlassian.net/browse/POS-2924
https://docker.atlassian.net/browse/SEG-1102

## Reviews

<!-- Notes for reviewers here -->
<!-- List applicable reviews (optionally @tag reviewers) -->

- [ ] Technical review
- [X] Editorial review
- [ ] Product review

---------

Signed-off-by: Cesar Talledo <cesar.talledo@docker.com>
Co-authored-by: Sarah Sanders <sarah.sanders@docker.com>
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Cesar Talledo 2025-04-16 06:13:36 -07:00 committed by GitHub
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@ -250,6 +250,15 @@ The following `admin-settings.json` code and table provides an example of the re
|:-------------------------------|---|:-------------------------------|---|
|`kubernetes`| | If `enabled` is set to true, a Kubernetes single-node cluster is started when Docker Desktop starts. If `showSystemContainers` is set to true, Kubernetes containers are displayed in the Docker Desktop Dashboard and when you run `docker ps`. `imagesRepository` lets you specify which repository Docker Desktop pulls the Kubernetes images from. For example, `"imagesRepository": "registry-1.docker.io/docker"`. | |
> [!NOTE]
>
> When using the `imagesRepository` setting and Enhanced Container Isolation (ECI), add the following images to the [ECI Docker socket mount image list](#enhanced-container-isolation):
>
> `<custom-image-repo>/desktop-cloud-provider-kind:*`
> `<custom-image-repo>/desktop-containerd-registry-mirror:*`
>
> These containers mount the Docker socket, so you must add the images to the ECI images list. If not, ECI will block the mount and Kubernetes won't start.
### Features in development
|Parameter|OS|Description|Version|